PiMAME Update
I haven't posted for a while regarding Shea Silvermans excellent PiMAME. It has been upgraded a lot since the first version with many more emulators being added, it now includes -
•MAME - AdvanceMAME & MAME4ALL
•Neo Geo - GNGeo
•Playstation - pcsx-reARMed
•SNES - SNES9x
•Gameboy - Gearboy
•Gameboy Advance - GPSP
•ScummVM
•Atari 2600 - Stella
•Cavestory - NXEngine
It's constantly being updated with VICE (C64) being introduced in the next version and on-going work to include puddings PiSNES (Super Famicom/SNES), DGEN (MegaDrive/Genesis) and AdvanceMESS (various computers/consoles). Well worth a look if you require/are looking for a 'pre-built' Gaming O/S and an alternative to Retro Pie.
Link Here - http://pimame.org/
Sheas Blog - http://blog.sheasilverman.com/
Note to Moderators, I have also added this post to the EMULATION ON THE RPi (UPDATE) Thread along with puddings FBA.