Two more movie posters have been released... and we finally get a robot on one of them.

The main girl in the movie, and, it's Optimus looking very human (how the heck are the designers supposed to turn that into a truck... without a backpack of flat panels).

Too much power to keep Bay coming back, is making it more difficult to translate his visions into toys.

On a more creative note, this movie's internet marketing campaign is actually hidden in today's Trailer. The phone number to report Transformers on, on a billboard near the start of the trailer, apparently has a recorded message to direct you to a website for you to register for updates.
The site is transformersaredangerous.com and it allows you to register your email address (with date of birth and zip-code - it requires 5 digits, so add a zero in front of your post code, or just type in something random). It is likely to have clips, or "secret" footage or info, like the Sector 7 site did for the first movie.