Just ahead of the new year, someone mentioned namebench on slashdot. I've just given it a try - it's dug out some fast public DNS servers, which are *way* faster than the one my ISP gives me, and also faster than OpenDNS.
Why would you care? Well, in most page loads, the DNS lookup is amongst the single slowest component. Whilst namebench isn't quite ready for the average user, it's good for the more tech-savvy, and migh just make your browsing experience a little niftier.