when i run fallout and i click on Data Files, all mods are allways unselected. do i need to select them all one by one every time i want to run them? is there a way to auto-select them?

Use http://www.fallout3nexus.com/downloads/file.php?id=640

Should probably check the mod faq: http://www.gamesas.com/index.php?/topic/972878-fallout-3-mods-faq/

Arwen has a tonne of excellent info as well, check it out: http://amito.freehostia.com/Fallout/FO-tips.htm#mods_101