P4 2.2GHz and D845BG Review
1.6 GHz and 1.8 GHz Northwood chips are going to be available soon; these will likely be reaching some nice overclocks (maybe up to even 2.4) and these are the chips to get. They're also the only ones most of us will be able to afford, given the way Intel prices their chips (see here).
I'm using an Athlon 1 GHz now and getting nearly a 40% overclock out of it, on an Iwill KK266-R board (KT133A SDRAM), at 155*9; it's not worth it to me to upgrade to an Athlon XP or a DDR chipset.
Overclockers.com, probably my favorite site, has daily bits of news and a lot of information lately on Northwoods. Apparently Intel is working on a dual-channel DDR chipset which should be a treat.