Thursday night, Comcast's DNS servers were totally hosed. It was a nationwide problem (the recording on their tech-support line said so).
Since I moved into my own place a year ago, I've had more problems with Comcast than I care to mention. I've had to have techs out here several times, for both Internet and television related problems. In addition to that, the lazy technician bastards that come out here never clean up outside when they're done. There are these big green 'tube' shaped things outside of each building, where the 8 or so condos that have cable all connect to the main feed. Every time they come out here to do work, they leave the things open with all the wires sticking out, and each time I call Comcast to report it and have someone come out and fix it. They leave the damned things open for water and other elements to get in there, which is just going to create more work for them when something gets in there and screws up the connections (not to mention interrupt connectivity for people).
When I lived with my parents, we had so many problems with their Internet service that we just switched to DSL. Never had any problems with it.
In short, I hate Comcast.