OpenDNS is a great new service that:
[...] helps you navigate the Internet in a safer, faster, smarter and more reliable way. The service is free and requires nothing to download. OpenDNS doesn't replace your existing Internet connection, it just makes it better.
It can prevent phising attacks, fix common URL typos, and speeds up DNS lookups (e.g., finding the IP address for http://www.google.com).
OpenDNS is very easy to setup and has great step-by-step directions for all routers, highly recommended!