Since overclocking is what you're after, I've moved the thread to the appropriate forum.
I have no experience with the Q6600, so, I won't delve into any attempt to offer a guide. Someone else with experience with this motherboard/CPU combo will need to do that.
I have, however, been able to do a decent OC on my E6700. (From 2.66 -> 3.36 very stable. But, probably could get even more.

)
EDIT: Corrected OC speed.