Fallout 3 - Favorite Mods

Logan's post about the 'Greenworld' Mod got me thinking about the freakishly awesome mod support for Fallout, name some favourites of yours.

This easily takes the cake for my personal favourite:

Warhammer 40k Space Marine armor - http://www.fallout3nexus.com/downloads/file.php?id=4651

That just looks so amazing, the Terminator beta armor is easily the coolest armor set out there.

And the Classic Advanced Power Armor - http://www.fallout3nexus.com/downloads/file.php?id=4641.

And the Terrain Pack - http://www.fallout3nexus.com/downloads/file.php?id=774.

So, what mods do you use?, if any, and if you don't use them, WHY THE HELL NOT PEOPLE!