Amazing when you think about it, really. On the promise of the Pre and the company’s new WebOS operating system alone, Palm (PALM) has added more than $1.5 billion to its market cap. A quick and impressive recovery, and one that analysts say is likely to continue now that the device has had a successful launch.

In an investment note today, RBC analyst Mark Abramsky esimates that Palm has sold 150,000 Pre handsets to date and predicts it will sell 4.1 million in fiscal 2010 and 6.5 million in fiscal 2011.

Over at Credit Suisse (CS), analyst Deepak Sitaramaneven is even more optimistic. He sees Palm selling 7.7 million Pres in 2010. “The successful launch of the Pre at Sprint Nextel (S) has raised carrier interest given Palm now offers a credible alternative to Apple (AAPL),” Sitaramaneven wrote. “We believe this will drive top-line growth of 144% in calendar 2010, and our estimate is predicated on 7.7 million units in calendar 2010.”

That seems a rather…buoyant prediction for a company still grappling with Pre supply issues. That said, if Palm is able to score distribution deals with Verizon (VZ), AT&T (T), Vodafone (VOD) and others by the beginning of next year, the prediction may be within the realm of possibility. Something to think about as the company prepares to report quarterly earnings tomorrow.

In an investment note issued this morning, Munster estimated that the company sold 750,000 iPhones over the weekend–25 percent fewer than the one million units of the iPhone 3G model Apple sold during the launch of that device last July, but 50 percent more than the 500,000 he originally predicted.

“The only true benchmark for judging the launch of the iPhone 3G S will be the time it takes Apple to sell 1 million units. Apple sold 1 million 1st generation iPhones in 74 days and 1 million iPhone 3G units in 3 days. We are uncertain whether or not Apple will announce the 1 millionth iPhone 3G S; regardless, we are increasingly confident in our 5 million iPhone unit estimate for the June 09 quarter following the price drop of the iPhone 3G from $199 to $99 in early June and the launch for the iPhone 3G S, where interest in the device surpassed our expectations.”

A few other points worth noting from Munster’s note. The analyst surveyed 256 customers at Apple (AAPL) stores in New York and Minneapolis over the weekend about their preferred OS, the size of the iPhone they were purchasing and the phones from which they were upgrading, among other things (see table below; click to enlarge). In the 256, he found a mix of 66 percent Mac users and 34 percent PC, similar to what he found last year (61 percent Mac, 39 percent PC).

Of those surveyed, 43 percent purchased the high-end 32-gigabyte iPhone 3GS, less than the 66 percent of buyers who purchased the 16GB iPhone 3G last year. And 56 percent were upgrading from an old iPhone–up from 38 percent last year. “We believe this shows Apple is developing brand loyalty not enjoyed by other mobile phone makers,” Munster notes.

“At the outset of the company’s iPhone initiative, one of Apple’s goals was to develop the kind of brand loyalty it has developed among Mac and iPod customers, and we believe they are succeeding thus far. As the footprint expands, and loyalty expands as well, Apple will increasingly enjoy a base of customers who regularly upgrade to the newest version of the mobile phones the company releases in what appears to be an annual cycle.”