Review on Adafruit Pro Trinket 16MHz Piece by Dave Moody

Such a cool little device. A fully Arduino compatible board that can do pretty much everything the Arduino Uno can. The only difference is that pins 2 and 7 are not used (they are occupied by USB), there is no USB serial connection so you need a separate FTDI interface if you want to debug or send serial commands, and there is no 3.3v output voltage. This model is only 5 volts. I've used it for everything from pranks at work to designing wireless remote controls for things around the house. There's nothing like this crazy cheap little powerhouse, once you've bought one you're sure to download a few more!