Here's another great little link I found just yesterday:
http://home.covad.net/~zeiler07/index.html
Some great registry bat files to optimize your WINXP system with one click. But, most importantly, if you're on DSL the CableNut tool he has is really awesome. Supply a few values and from there you get a ton of recommended CableNut tweaks. My connection speed tripled after using this! All-in-all, a great little page, and I highly recommend it.
torataka