For a game with 100 hours of gameplay it was really kind of Bethesda to give us a brief look at the world of Fallout 3.
Fallout 3 Vault Dwellers Survival Guide
http://www.shacknews.com/screenshots.x?gallery=10662&game_id=4244&id=125373

Fallout 3 Promotional Site
http://www.prepareforthefuture.com
Vids from Fallout 3
HD Versions on the Official Site
Youtube versions below.
(If you want to skip the plot and go straight to some combat violence, watch Video 4 – Super Duper Mart. If pneumatic fists that can punch people’s faces off are your thing you might enjoy that one.)
For real and substantial choices between good and evil there is no one else that even comes close to the Fallout universe. For all Bioshock and Mass Effect’s claims that they had true choices and consequences, they really led you down the path of good or evil and that was that. Fallout lets you explore the dusty moral wastelands in between; which is a far more vast and interesting territory, don’t you think?
These videos may become available on xbox live. I’m going to go check.
Gameplay Video 1/5 – Escape
click read more for the rest
Gameplay Video 2/5 – Megaton
Gameplay Video 3/5 – The Wasteland
Gameplay Video 4/5 – Super-Duper Mart
Gameplay Video 5/5 – Tenpenny Tower