BoomTown is back from a lovely holiday vacation and am gearing up for the Consumer Electronics Show, which starts later this week in Las Vegas, but I have been struck by the $1 billion-plus haul that tech-heavy “Avatar” has brought in over that time.

Does this mean movies in theaters are holding their own against online incursions?

It would seem so, according to box office reports for the year. Tallies for the U.S. alone were up 10 percent to close to $10 billion for 2009.

Or is there trouble behind this success, since another key revenue stream is weakening?

According to a report in The Wall Street Journal today:

Last year was the first since 2002 that U.S. consumers spent more money buying movie tickets than buying movies to watch at home, underscoring the changing economics of Hollywood…

The figures indicate that studios will likely have to continue looking for ways to survive in a marketplace where they can’t count on hefty home-entertainment revenue to offset giant production costs. Those costs often more than eat up the studios’ half of the box-office receipts, which are split with theaters.

The ongoing decline in home-entertainment revenue has already fundamentally altered the way studios do business, forcing them to place big financial bets on hoped-for mass-market blockbusters at the expense of features that cost less to make but that also have smaller earnings potential.

Since online movie purchases and rentals are nowhere close in terms of revenue (see chart below), declining DVD sales could be a worrisome trend for Hollywood.

We’ll see what happens in 2010. Until then, here are videos of the top 10 most-viewed trailers of 2009, according to Yahoo (YHOO)–which garnered many tens of millions of views on its popular movie site.

Most–but not all–of them track on the big box-office winners, although the group includes an unusual one: “Mega Shark Vs. Giant Octopus,” starring Lorenzo Lamas, which was not exactly a hit.

Here they are:

No. 10: UP

No. 9: AVATAR

No. 8: MEGA SHARK VS. GIANT OCTOPUS

No. 7: STAR TREK

No. 6: G.I. JOE

No. 5: HARRY POTTER AND THE HALF-BLOOD PRINCE

NO. 4: TERMINATOR SALVATION

No. 3: 2012

No. 2: TRANSFORMERS: REVENGE OF THE FALLEN

No. 1: THE TWILIGHT SAGA: NEW MOON

Big, giant and prolonged sigh–as well as a cranky-old-lady shake of the fist–to our distant cousins over at the Fox television network, who dinged BoomTown’s favorite sci-fi show, “Terminator: The Sarah Connor Chronicles,” today.

I am officially in a Summer Glau funk, with major gadget withdrawal.

After much fake agonizing over the fate of “Sarah Connor,” Fox programmers finally stuck a fork in the series after two seasons. Loosely based on the movie franchise, the show garnered a passionate fan base online and off, but not enough to merit being renewed.

It’s ironic since the latest film in the cyborg-versus-man epic, “Terminator Salvation,” will open this Thursday.

It is the next blockbuster in a tech-heavy summer movie season, following the boffo reception that the new “Star Trek” has gotten (next up: “Transformers: Revenge of the Fallen”).

But the arrival of “Terminator Salvation,” with its noisy, Armageddon-is-nigh theme, could not save the more thoughtfully dark “Sarah Connor.”

Thank goodness, then, for YouTube and a very pissed-off and half-naked young actor named Thomas Dekker, who plays a teenage savior of humanity, John Connor, in the TV series.

In this perfect online video clip he did himself, the real-life (and very wild-eyed) Dekker calls Fox’s viewer comment line to express his support for the show in no uncertain terms:

Full disclosure: News Corp. (NWS) owns Fox, as well as Dow Jones, which owns this Web site.

With bootleg copies ripped on the Internet or not and with an $87 million opening weekend for “X-Men Origins: Wolverine,” it looks like the nerdiest summer movie season ever is off the races.

Hollywood, caught in the digital maelstrom, certainly is fine and dandy making bank by co-opting all the techie themes, gadgets and special effects, with a slate of movies over the next months that are like catnip to geeks of all kinds.

Including BoomTown, for example, which plans to fork over a lot of dough to pay for all the techtastic entertainment that those old media moguls can dish out before they collapse.

Here’s the roster and video trailers of key movies this summer:

Star Trek, May 8

It looks sassy enough with a hot, young cast in what is, like “Wolverine,” a prequel from when the crew of the Starship Enterprise were mere pups.

But one funny quibble comes from a post on the Mania.com blog called “10 Reasons to be Worried About ‘Star Trek’”:

“The New Bridge Looks Like an Apple Store: I love my iPod, but all the Apple Stores I’ve visited are located in the 21st century, not the 23rd. Made of frosted plastic shades and lawn furniture borrowed from the local Pinkberry, the bridge looks built to handle scenes of Kirk negotiating a kegger with the Vulcans more than the sparking explosions and flying bodies of the original.

One can imagine Kirk, trying to sweet-talk his latest alien conquest, and the bridge’s iTunes shuffle mode kicks in.”

Angels & Demons, May 15

Mathematical formulas, hidden puzzles to figure out the path of light through Rome, antimatter, Galileo?

Oh, I am there, except for Tom Hanks’s (playing Robert Langdon) shorter but nonetheless unfortunate haircut from “The Da Vinci Code.”

That and all the glaring but entertaining inaccuracies about science, religion and art from author Dan Brown. As if, I care.

Terminator Salvation, May 21

I am still in mourning over life without Summer Glau, given that the television show, “Terminator: The Sarah Connor Chronicles,” might be canceled after lackluster ratings in its second season.

I will have to trade that superb show for the grumpy grumbles of Christan Bale as John Connor in this fourth outing of the killer-cyborgs-from-the-future series of movies.

This one is set in the post-Judgment Day time, so it will have a lot of dusty, oily fighting with machines and grim grimaces about the dire situation (which, to be fair, bites).

Still, as always with my beloved “Terminator” movies, I’ll be baaaaaack.

Transformers: Revenge of the Fallen, June 24

More machines noisily battling it out while humans get stomped. Sometimes, I think these movies have been thought up by people who hate their cellphones.

Still, the first “Transformers” was funny about all the tech, and this one looks like it could be amusing too.

Also, given that I have two young boys, I have played with a lot of Transformer toys since the last movie came out and they really are cool.

Harry Potter and the Half-Blood Prince, July 15

I. Love. Harry. Potter.

I cannot control this fact and I am a wee bit perturbed by it.

But it is so, especially with all the creepy special effects that seem to get super-creepy in this sixth outing.

These movies just have gotten better and better, as have the young actors who play the main parts, so it’s hard to imagine it not being completely excellent.

Also, the whole pensieve thing rocks. The whole Dumbledore thing, not so much.

[PhotoShopped "Star Trek" publicity still courtesy of Mania.com]