AUGH! Not another "How do I OC a Q6600" post.
Sigh.
Judging from the time stamp on your post, you are being ignored - probably people are hoping that you will do some of your own research.
Here are two links from the forums here:
http://www.tomshardware.com/forum/240001-29-howto-overclock-quads-duals-guide
http://www.tomshardware.com/forum/245679-29-guide-overclocking-ds3l-updated-2008
The first one deals with overclocking Intel Core2 CPU's. The second is about OC'ing Gigabyte P35 motherboards. Yes, I realize that you have a P45 motherboard, but the the BIOS's will be very similar.
After you have done some of your own research, if you have questions, ask. We will be glad to help.
I have looked at your system components and ... not bad.
I would not have sprung for the 1000 MHz RAM, but otherwise, pretty good components. One question, what kind of HSF do you have. If all you have is the stock Intel heatsink, you will be limited to about 3.0 GHz at reasonable core temps.