Unless there is some major glitch, there might finally be a search and online advertising deal struck between Yahoo and Microsoft at long last.

Top executives at Microsoft–including SVP of the Online Audience Business Group Yusuf Mehdi, search head Satya Nadella and top digital exec Qi Lu, as well as others–have all flown down to Silicon Valley from their Redmond, Wash., HQ today to iron out the remaining issues, which seem to have to do with the deployment of technology.

“It is an entourage,” joked one exec.

Microsoft CEO Steve Ballmer is also deeply involved in the talks, although he is not with the group.

If all goes well, the deal could be announced within the next week, sources at both companies said.

The most recent talks have been unusually close to the vest at both companies, and spokespeople for both Yahoo (YHOO) and Microsoft (MSFT) declined to comment on the issue.

And, of course, they should not, since there is no certainty any deal will be struck at all, especially since the pair have been down this road before, unsuccessfully.

In those cases, both sides have thought they were close, too, with fingers quickly pointing at each other for the failure of the discussions.

While BoomTown has gotten several different versions of terms of the latest deal, they all include Microsoft (MSFT) paying Yahoo (YHOO) several billion dollars upfront to take over its search advertising business and guarantee certain payments back to Yahoo.

There is also a display advertising element to the deal, which would likely have Yahoo take the lead in selling premium advertising for the companies.

That they are so close is a good sign, although sources on both sides of the deal cautioned that it could just as easily come apart.

And, indeed, Microsoft and Yahoo have long argued the particulars of this deal, including over the rate for traffic-acquisition costs, the ability of Yahoo to have control over data and the simple fact that such an arrangement is exceedingly complex.

But, said one person close to the situation, “It is down to the short strokes, for sure, it is just a question if we can finally close this.”

That’s a good question, given the push-me-pull-you relationship between Yahoo and Microsoft over the last two years.

But both need each other, especially since they lag so far behind search market leader Google (GOOG).

Yahoo was even ready to strike a similar deal with Google in the midst of Microsoft’s hostile takeover attempt last year. That partnership failed due to regulatory concerns.

Talks between Microsoft and Yahoo have waxed and waned too, as I reported earlier this week.

When last we checked in, Yahoo CEO Carol Bartz and Microsoft’s Ballmer had a little private tete-a-tete about the deal, when both were attending the seventh D: All Things Digital conference in Southern California in late May.

Bartz and Ballmer also both acknowledged discussions in onstage interviews at D7, with Bartz even boldly stating that she was open to the deal if good and reliable data and “big boatloads of money” were forthcoming from Ballmer.

(You can see the video of her saying that here, while Ballmer is less colorful here.)

Since then, Microsoft did an aggressive launch of its new Bing search service, which has been an initial success.

The company has become more confident with the early success of Bing, which has garnered good reviews and small improvements in market share in surveys.

Sources at the software giant maintain that the improvement–via innovation and a huge marketing spend–has given Microsoft a bit of leverage against Yahoo, although the bets are still out on exactly how much sustained share Bing can garner.

Yahoo is aware, of course, that is can ill afford to lose search market share, although Bartz has been focused on beefing up Yahoo management and marketing.

Still, the companies have never given up on the talks, which began in March, although all the back and forth underscores a very real debate by both sides about whether joining together will benefit them both or not.

The possible pluses are clear: Huge technology cost-savings and cash for Yahoo and another weapon to fight archrival Google for Microsoft.

It needs as much firepower as it can get. A recent comScore (SCOR) report for June showed Google with a 65 percent share, Yahoo at 19.5 percent and Microsoft at just 8.4 percent.

The deal, if struck, could give a big boost to shares of both companies, which have been up a lot since the beginning of the year.

While sources at both sides stressed that this was in no way a merger, a deal would bind their fates together rather strongly.

There was a report earlier today by 24/7 Wall Street that a deal was “imminent.”

One source advised caution when asked about that word, although this person was more confident than ever.

In any case, if it does not work out, the source said, “this will be it…we will all finally go our separate ways and be done with it.”

The Palm (PALM) Pre officially went on sale this morning, and judging from initial reports–and my experience at a local Northern California Sprint store–neither demand or supply was particularly overwhelming. Certainly, lines for the device were far shorter than those that extended from Apple (AAPL) stores for the launches of the iPhone and the iPhone 3G.

Arriving outside my local Sprint (S) store about an hour after they first opened, I found not a queue of eager Pre-buyers, but two kids making forts out of a few Pre shipping boxes left outside the store. Inside the store, I found a group of nine people waiting in line to add their names to a waiting list for the device, which was already sold out at this location. A Sprint rep refused to tell me how many Pres had been sold this morning, but admitted that the shipment had been a small one.

The situation is apparently the same across the country. The Boston Globe reports that Sprint’s Back Bay store sold out of its 55 Pres by 11 AM. An informal survey by 24/7 Wall Street reveals sell outs or fast-dwindling supplies of the device at Sprint and Best Buy stores in Chicago, Houston, San Francisco and Los Angeles. Four of the five Best Buy stores I contacted reported selling out of the Pre very quickly; one representative told me his store had just four of the devices and he believed that to be the case at many other locations.

Sprint stores I spoke with in LA, Chicago and Boston told me they’d sold out by late morning.

Q: How many names on the list? A: “We’re not allowed to say.” A reader tells me that the line outside the W. Division Street in Chicago was at least 50 people long, and that the store started wait-listing people somewhere around #36. Another reader reports a line of about 20 people outside an Emeryville, CA Sprint store. That same reader claims a clerk told him the store had 60 Pres on hand. Still another reader reports that the line outside Sprint’s Market Street store in San Francisco started at 6 AM this morning. There were a dozen or so folks in line by about 7:30 AM. Finally, another reader reports that a Sprint store in San Francisco’s Castro district had a line of about 40 people when she showed up to get in line at 7 AM. That location, too, sold out quickly.

Four phones at the local Best Buy? Stores in Marin, LA and Chicago sold out within hours? Makes you wonder if Palm and Sprint are purposely constraining supply to foster an image of overwhelming demand.

Huffpo’s newest round values the company at about $100 million, which means its investors think it will be worth much more one day. That’s the same value, more or less, that investors place on TheStreet (TSCM), even though it generated some $65 million last year and has about $80 million in cash on hand. McIntyre:

Huffington has several important advantages over TheStreet. For starters, it does not rely on one person for most of its traffic. If Jim Cramer left TSCM, the company would be in real trouble.

Second, Huffington has diversified beyond it political news base. Over the next year or so, it will become clear whether that was a good idea or not. Adding “style” and “entertainment” sections puts it into competition with a lot of other online success stories.

Third, Huffington aggregates a lot of content from around the web. The cost of doing this is remarkably low. The company pays little if anything to most of its bloggers. TheStreet has a relatively large staff and produces most of its own content.

The final difference between the two companies is probably the most telling. At its current rate of growth, which could be hurt by the end of the 2008 election process, Huffington may double in size again over the next year or so, if its efforts to diversify its content works.

It would be hard to find analysts who believe TSCM is going to expand its audience or revenue at a rate of 100%.”

I can think of some counter-arguments to this, but they’re half-hearted: TSCM’s affluent readers should be worth more to advertisers than Huffpo’s; TSCM still has a revenue stream from subscribers to buffet it from ad market turmoil; Huffpo’s aggregation model isn’t unique and could be replicated by anyone who wants to hire some devilishly clever Web editors, etc.

But better to acknowledge that the HuffPo crew have built something very big, very fast. And that anyone who does that gets rewarded for it, even in an econalypse.