MameChannel: site about MAME and other emulators. Them IRC channel is full of Mame roms.
MamEnd: you can see the end of the MAME games and the picture of hot games
Madda's MAME: site about Madda's MAME, an italian build. In this site there's also a guide to the compilation of Mame, Mame Dos and the Mame32 in italian
MameMan: MAME italian site with a forum
Mame32FX: build of Mame with a lot of special features