Product details:

The ATtiny85-based mini development board is similar to the Arduino, but cheaper and smaller (of course a bit less powerful). With a whole host of shields to extend its functionality and the ability to use the familiar Arduino IDE, this board is a great way to jump into microcontroller electronics.

Specification:

• Support for the Arduino IDE 1.0+ (OSX/Win/Linux)
• Power via USB or External Source
• Onboard 5V Regulator
• Built-in USB
• 6 I/O Pins
• 8k Flash Memory (about 6k after bootloader)
• I2C and SPI (vis USI)
• PWM on 3 pins (more possible with Software PWM)
• ADC on 4 pins
• Power LED and Test/Status LED