Programs to DL: Prime95, Memtest86+, CpuZ, CoreTemp.
In the bios, set your memory to DDR2-800 (instead of DDR2-1066) if it has that option. Set your RAM timmings to 5-5-5-15. Under voltage controls, turn the cpu auto voltage to manuel, it should pick a voltage around 1.2 or so. For the RAM the voltage should also be set to manuel, it should be between 1.8-1.9V or so, somtimes its listed as +0.1V or something like that, that means the base voltage is 1.8V and they are adding 0.1V which gives you a total of 1.9V. Disable: EIST, and C1E, both are power saving modes that should be off until your done making sure the system is stable. If you have the stock intel fan you need it to run full speed, so disable 'fan speed control', its still very quiet.
Get the Memtest image file burnt to a CD, this already bootable. this program will tell you if your memory makes errors (under the error column). When you raise the cpu FSB above 400 you should start running memtest prior to booting into windows and let it run one pass to make sure the memory does not make errors, otherwise your windows isntall can become corrupted.
When you start to OC the fsb, the memory is what you have to keep an eye on, there is no need to get big DRAM speeds because that is not where the performance comes from in C2D cpu's, its all about getting the FSB up. Don't push it at first, move in steps of 20 for the FSB, you can probably start it at 400, so long as the memory settings are correct and your using a 1:1 ratio for the DRAM:FSB.
Please do google searches before asking every single question here, there are already people who have posts on the net about OC"ing your MB. The problem is your BIOS supposedly has more features added to it and I couldn't find screen shots of it to see what settings are availble.
When you get into windows, you want to test stability. Don't run any important files or surf the net while doing this because if the system is not stable you can corrupt files. So run Coretemp, cpuz, prime95. Watch that the temps don't go too high, 65C is a high enough ceiling. In cpuz you can check that your memory is set correctly and that under "Bus Speed" should be around 400 to start. In prime95, choose torture test "small ffts", and when you run that watch the temps go up in Coretemp.
After you do the initial setting, make a screen shot of cpuz, so that we can see if you were able to get the system at 1:1. There may have been another setting in the bios to set that.