Adafruit Part Number: 1500
ATtiny85 on-board, 8K of flash, 512 byte of SRAM, 512 bytes of EEPROM
Micro-USB jack for power and/or USB uploading, you can put it in a box or tape it up and use any USB cable for when you want to reprogram.
USB bootloader with a nice LED indicator looks just like a USBtinyISP so you can program it with AVRdude (with a simple config modification) and/or the Arduino IDE (with a few simple config modifications)
Internal oscillator runs at 8MHz, but can be doubled in software for 16MHz

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