Newsforge has a good article on OpenDNS, which offers
a few free services on top of the traditional DNS to block phishing Web sites and auto-correct common misspelled URLs. And thanks to some clever traffic routing and load-balancing technology, OpenDNS can also deliver Web pages faster.
I’ve been using it for some time now, and although I can’t be sure of how much it speeds up things, it has saved me from some potentially embarrassing typos.
I highly recommend OpenDNS, but be aware that you’ll have to edit your router settings to add the appropriate DNS server addresses.