Google has Public DNS available.  http://code.google.com/speed/public-dns/index.html 

Yawn.  In other news, scientists around the world predict that the sun will come up tomorrow.

Usually Google does great things, but this time I'd say their efforts were next to useless.  Or, maybe Google doesn't google, and they aren't aware of what is already available on the Internet as far as DNS service providers go?

I highly recommend OpenDNS for all of your DNS needs.  They do filtering of bad sites (NSFW), anti Phishing and Malware site protection, as well as blocking of time wasters.  And much more, I can't do their service justice here!  Here's the overview of OpenDNS services.

Compared to the Google DNS, I would pay for using OpenDNS.  Google DNS –  I'm still not sure I understand why you would bother to use their service.  If you want secure DNS then run your own DNS server.  It's not that hard to setup, really!  Why would someone that attacks DNS go after individually run, low volume DNS servers?  They would attack something bigger, and something worth their while.

Ok, now I will admit, Google Public DNS is hundreds of times better then the DNS services provided by some ISPs, namely Verizon.  Verizon likes to 'help you', and instead of returning NXDOMAIN like DNS is supposed to for missing domains, it directs you their catchall website.  Google Public DNS currently reports NXDOMAIN, so you won't get useless screens of advertisements for what they think you wanted.  So Goggle did get at least part of DNS service right.  But how long before Google wants to also 'help you' by directing you to their own search page?