BetaMan, there are several utilities that can check your CPU's temps.
CoreTemp is one of them and it's quite popular. Overclocking is done in your motherboard's BIOS. I'd go into it more, but I doubt your motherboard includes the options needed to overclock. PCChips isn't known for it. You might be able to adjust your Front Side Bus (FSB) some for a minimal overclocking if you're lucky.
Also, hi everyone. I came here by Thrax's recommendation. My main rig is 4GHz (480 x 8.5) Intel Core 2 Duo E8400 on a DFI Lanparty LT X48-T3RS motherboard with 2GB OCZ ReaperX DDR3-1333 in an Antec Nine Hundred case, cooled by a Xigmatek HDT-1283.
Happy to be here.