Here is a simple tutorial on building your own Arduino compatible breadboard. The board is controlled with an ATMEL8 AVR microcontroller and a Spark Fun Breakout Board for FT232RL USB to Serial .Its a good project to start into programming microcontrollers, but if you dont like building it you could buy one already built from the Make store.

Arduino compatible breadboard

Arduino compatible breadboard with an ATMEL8 AVR microcontroller : [Link]