Howtodothings
With the introduction of emulators and roms, it is possible to play classic games on just about any game console, including snes, nes, and sega classics on your sony psp.
http://www.howtodothings.com/hobbies/put-snes-nes-sega-and-other-classic-games-on-your-sony-psp
Kanyetothe
Classic games: sega, nintendo, etc. [emulator/roms discussion]
http://www.kanyetothe.com/forum/index.php?topic=159060.0
Segastyle
Emulators, bios, and tools for sega gensis cd 32x.
http://www.segastyle.com/genesisemulation.html
Emulator Zone
Emulator Zone
http://www.emulator-zone.com
Sega Genesis
Hundreds of sega genesis roms with the sega genesis emulators used to play the roms
http://www.freeroms.com/genesis.htm