ATtiny2313
The ATtiny2313 seems to be the “coming of age” chip in the AVR scene. It is very powerful and pretty small. There are many projects that use this chip
- MiniPOV3 kit from Adafruit for prototyping which is absolutely awesome
Breakout board for ATtiny13a, ATtiny25, ATtiny45, or ATtiny85. It has a 6-pin ISP header, all the data pins are lined-up for easy usage, reset button, and JST power.
The Brain Machine (Sound & Light Machine)
Trippy brain hack.