Continue play after completing main quest(NEW)
Interactive Flash and PDF maps of the Fallout 3 world(NEW)
Mod removing Level Cap at 20 and Skill cap at 100.
EXP and level up reducing mods.
Pip3000 UI mods and different colored skin models.
Weapons and character stat balancing mods.
Exciting Power Armor skins.
Cool characters like Chuck Norris and Doomsday Wasteland Queen.
New weapons and hi-res weapon textures Hi-Res monster skins. Different uniforms and outfits.
New game music and sounds
You can go here for the 500 MB download. I'd be most interested in the continuous play mod. Oh wait, how about the mod that let's me play the game D: