Rehash of a post I already made on this topic.
www.rage3d.com should get you started. They have an Overclocking utility that should fit your needs. I know it works for Radeon and Radeon 8500 chips alike. I got my radeon AIW from 166 to 184 with it. Your mileage will most certainly vary.
Note: Can't use it with Adobe Premiere installed.
http://www.rage3d.com/radeon/r3dtweak/
Intel is god, cleanroom is life, and the wafers are all that matter.