Links

The following locations have a good amount of resources, and I would recommend checking them out.

http://www.spies.com/arcade Al Kossow's most exellent Arcade Resource page! Always check here first for anything!
http://www.jrok.com JROK's home page full of interesting stuff, including his emulator, schematics, etc.
http://www.gamearchive.com A lot of useful information on Arcade Games.
http://www.oakland.edu/~phkahler Home of the Original Cinematronics Emulator!