ROM Images

ClassicGaming.com
Large collection of ROM Images, and emulators for classic systems.
http://www.classicgaming.com/vault/

The Dump
Rated, working ROMs for Neo Geo, Genesis and TurboGrafx-16.
http://thedump.classicgaming.gamespy.com/

MagicPack.Net
Amiga demo pack disks compiled and released by Majic Mushroom during 1990 - 1993.
http://www.magicpack.net

PDRoms
ROM Images of console and arcade software released to the public domain.
http://www.pdroms.de/

RomCenter
A rom managing tool for various systems with built-in zip function.
http://www.romcenter.com/