AVR-PG2 is simple and inexpensive programmer for AVR. It connects to PC parallel port and is supported by two great free softwares: Pony Prog and the open source AVR Dude. You can check on these two links for the complete list of supported devices as they are constantly updated.

FEATURES

Connects to PC via parallel (printer) port (note it will not work with USB to parallel port converter!)
AVR-PG2B is compatible with STK200 parallel port dongle programmers.
no need for external power supply as it takes the power supply from target board.
uses Atmel's 2x5 pin ICSP connector layout
dimensions 50x30 mm (2x1.3") + 20 cm (8") cable