Try the sticky originally written by Clunk before he started his own forum, I miss him
http://forums.hexus.net/hexus-hardwa...beginners.html
As it stands for c2d cpu's it's very easy, very basically set the memory timings manually, then set it to 1:1 ratio, turn of speed step and any other energy saveing things in the BIOS.
Now start raising the fsb and testing, untill the FSB will not go higher or you reach a speed you're happy with.
That's very basic, read the thread before trying it, but at that level should get you about 100+ extra on the fsb, before you start hitting v-droop issues.