The following links are sources of information and vendors:

1UP’s Arcade
Adafruit
All Electronics
Arcade Art Library
AVRDude
AVR Freaks
Ben’s Hobby Corner
Bit-Tech
BYOAC
CNC Zone
AVR Fuse Calculator
Game on Grafix
Groovy Game Gear
Hack A Day
Happ Controls
KLOV
MALA
Mame World
Marco Specialties
Math World
MCS Electronics
MESS
NUI Group
Objective Development
PCB Heaven
Romaxx CNC
Ultimarc