Roms Mania - A working online resource for roms.
GameStreamer - Connection people and games anywhere.
Gamulator - Gamulator is the n.1 place to find and download all the retro roms, iso's and games for your arcade emulator.
LabChirp - Create simple sound effects on Windows.
CoolROM - Download from the largest and cleanest ROMs and emulators resource on the net. Mobile optimized. Systems include N64, GBA, SNES, NDS, GBC, NES, MAME, PSX, Gamecube and more.
Apple Game Center - Game Center brings social gaming to OS X and iOS apps.