It is a simple to use USB AVR programmer

Key Features:

Uses an SMD 5×2 header
Works with AVRDude
Tested extensively on a Windows desktop
Based on Dick Streefland’s USBtiny and Limor Fried’s USBtinyISP
Ability to power the target (up to 500mA) from the programmer
The microcontroller-to-be-programmed can be any AVR with 64K or less of flash

Highlights:

Standard AVR ISP programmer
ATtiny2313 with USBtiny firmware preloaded
Buffered output
PTC fuse protected power
The programmer can power target
Supports ATmega168/328 and many others
Two status LEDs
Both 10-pin and 6-pin targets supported (cable included)

Part List:

1x Pocket AVR Programmer
1x AVR Programming Cable

Relevant Resources:
Hookup Guide