Questions from a complete newbie

Forum 2005-2010 (read only) General Frequently-Asked Questions
2

http://arduino.cc/en/Main/ArduinoBoardDuemilanove ATmega168
http://arduino.cc/en/Main/ArduinoBoardMega ATmega1280
http://arduino.cc/en/Main/ArduinoBoardLilyPad ATmega168V

Google:
Sanguino
Teensyduino

Some more, I'm sure.