This is starting to look more like a go. From Joseph Mallozzi's blog:

"To borrow a Gordon Ramsayism: “Stargate Atlantis Movie with satisfying conclusion…Done!”. Satisfying conclusion for who? Well, me for one. And, I suspect, for many fans as well although, of course, it goes without saying that you can’t please all of the people all of the time. Still, I’m very happy with the story we have and with our ending in particular. Some doors are opened, some slammed shut (rather violently), while others are left ajar for future exploration…in the next big adventure provided the fans support this one. Not quite as long as I expected but, given the action sequences, it still may clock in with a robust running time. Yes, all of the regulars and semi-regulars you’ve grown to know and love are in play - Sheppard, McKay, Teyla, Ronon, Woolsey, Keller, Zelenka, Lorne, Beckett, Chuck, Banks, and Todd - in addition to a couple of surprise guest stars. But more on them as we draw closer to the that first day of principal photography. As for when that will be…no firm date yet but I’m still banking on a fall production alongside the SG-1 movie."

The likely title for the movie is "Extinction".

"alongside the SG-1 movie" Another one?

The credit crunch hits Atlantis (and SG-1)!

Both movies are on hold because the economy is so poor and DVDs aren't selling so well, says Robert Cooper.