Before you overclock your 65nm quad core, you need to invest in decent cooling. They get hot and the stock Intel heatsink and fan just isn't going to cut it.
The second thing you're going to want to do is read, and read a lot. The very best "OC Software" is that grey stuff between your ears. No other installable tool comes close. Start here:
Howto: Overclock C2q (quads) And C2d (duals) - A Guide V1.7 - OverclockersClub Forums