Windows Software
From Wiki
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PCB Design software
All of the following PCB manufacturers provide free software for Windows that will do simple PCB layout:
http://pcbexpress.com
http://expresspcb.com
http://pad2pad.com
http://pcb123.com
http://www.cadsoftusa.com/ <-- Not a board house, but excellent software!
PCB Layout Software:
http://www.cadsoftusa.com/ Free for small boards, cheap for others, works well.
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AVR Programming software
Start with Atmel's tools, including AVRStudio 4. Its the defacto tool for windows users, and includes support for avr-gcc.
