On the other hand if you already have the Arduino, fetch the avr.isp.03 firmware and AVRdude. Then program a device, for example an ATtiny13 using the Ardunio as the programmer.

The tutorial is fairly straightforward, and even demonstrates how the Arduino can be used as an ISP for the ATtiny, removing the need to purchase a standalone programmer.

The Arduino ICSP Programmer allows you to create your very own Arduino board, simply connect the programmer to your Arduino compatible board and start uploading your boot loader or sketch.