You won't need much for this to work, unless you really want to push the Pi to its limits.
- A Raspberry Pi
- A Windows PC with Notepad++ installed http://notepad-plus-plus.org/download/v6.1.8.html
- A small heatsink and thermal paste (If you're going to go past 750 or 800mhz)
The heatsink can be bought from Jaycar (if you're in Australia) or Radioshack (If you're in America) or where ever else you can find a Pin grid array (PGA) heatsink. http://www.jaycar.com.au/productView.asp?ID=HH8580