When domain names go wonky, sometimes it can take a day or two for various changes to propagate. Which means you might see problems right away or not at all, depending on your ISP. Seems like their problems from yesterday are pretty much repaired, though.
If you're still having trouble, put these lines in your /etc/hosts file, which will fix it for the time being (until they change server providers, at which point you'll have forgotten that you did this and be all confused again). Alternatively, you could use the google public DNS (184.108.40.206 and 220.127.116.11) instead- they seem updated and they also mean you don't get that stupid comcast search page whenever you mistype a URL.