gp32x home of up to date gp2x news and downloads plus a great forum

http://www.gbadev.org/ - where a i got most of my gba roms

hermit games - great psx

zophar - has homebrew roms for various systems. got some roms from here

http://minigamecomp.org.uk/ - compo to write really small games. got some good stuff for atari 2600 and c64 here

http://www.llamasoft.co.uk - home of jeff minter's insanity

the new dimension - lots of great c64 games here