http://code.google.com/speed/public-dns/docs/using.html
8.8.8.8
8.8.8.4
Remember to note your old DNS server IPs first, in case you wish to revert.
Hmmmm
It will be interesting to see how this affects OpenDNS, who have just recently started a (very cheap) subscription model along with their free service. I have been using OpenDNS for a few years and it is certainly way more reliable than Slowpatico was!
http://www.opendns.com/
Hmmm, again!
They already have responded - http://blog.opendns.com/2009/12/03/opendns-google-dns/