Arcade Links

MAME Official Site
Russ Prince's Cabinet
Scott's Unicade
Arcade Controls (the best place to start)
Happ Controls
Ultimarc (for control panel interfaces)
Oscar Controls (spinner)
RetroBlast (excellent reviews for all products you'll need from hardware to software)
SmartStrip (for powering your cabinet)
MAME Marquees (art)
EMDKay (art)
GameLauncher (front end)
MESS Official Site
Stella Official Site (Atari 2600)
Daphne Official Site (LaserDisc Games)
Power Reference for MAL Receptacle
RetroBlast Coin Door Wiring Page