overclocking

I just got a new dual core cpu for my old mobo; an Asus a8n-sli
premium w/939 socket and I want to overclock my machine. I used the
jumperfree configuration in BIOS to 'automatically' overclock it to 8%
(it wont POST with the 10% setting) but that didnt seem to satisfy my
interest. I guess Im more interested in learning how to overclock
than I am about improving performance.

What's a good resource for someone that wants to learn about
overclocking, specifically a 939? (I googled "overclocking" and so
forth but most of the articles were just from IT ezines and didnt go
into much detail.)

Does anyone else have an overclocked 939? Any tips on overclocking
the 939? is the dual core toledo a good overclockable cpu?

Thanks for your help...Shane