Arrgh, Comcast broadband was out of service for the longest period I have ever experienced. Service was out Fri morning when I left for work, Fri eve when I returned home, and part of Sat morning. Previously the longest outage I'd ever had was a few hours, maybe once a year.
Apparently it was a DNS server problem. Some research shows Comcast has had prior spates of DNS problems.
http://www.computerworld.com/securitytopics/security/story/0,10801,100960,00.html
Alas, I don't remember the numeric IP of any websites.
Perhaps the answer is to bookmark the numeric IP of Google. 216.239.51.99 And use Google to get to whereever you're going.
Will that work, next time Comcast has a DNS server problem?