Transformers launch in Second Life
The moviepromo is build by Silverscreen (who are also responsible for Die Hard 4 and a few other goodies) and is build in the sim Sector 7. It's an enormous build and they had less than 400 prims left when they'd finished.
The first pic is a Bumblebee avatar, though contrary to the original series it ain't a beetle, but it's a real American Chevy (must be a sponsor thingy). The second one is Megatron captured in the deeps of this huge build.
The build is actually a sort of double-decker sandwhich with dark sci-fi autobot HQ looks at the bottom with lots of tunnels, (press) rooms and such. The top level is the more cityscaped area with a huge dam - a centerpoint in the upcoming movie.
I was planning to say something sentimental on the Transformers, but it would be a copy of Moo Money's remarks at the Second Life Insider, so here's her view: