Continuing the tradition of releasing trailers on Marketplace long after we've seen them on the internet, the teaser for Fallout 3 is now available on XBLM. It is a teaser trailer in the strictest sense of the word. You won't be seeing any gameplay, just getting a look at the world of Fallout. In case you don't know, that world isn't particularly sunny. It is definitely pretty, though, in that destroyed beauty kind of way. Go download it and enjoy. Failing that, you can always watch the streaming trailer right now.