Eyonix is now reporting, as an update to yesterday's update, that Blizzard has resolved the issues with Comcast. So to quote the late, great Douglas Adams, "anything you still can't cope with is therefore your own problem." Which is not quite true -- Blizzard tech support and Comcast are probably still happy to listen to your issues (assuming you can get through their phone system), but the major outages from this weekend are reportedly solved.
There are still three stickied threads going in the technical support forums, so you can possibly find help or more information there if you're still having issues: Eyonix encourages anyone still having a problem to go there.
I'm on Comcast here in Chicago, but I didn't have any issues connecting this weekend (save for the fact that I was offline for half a day yesterday due to an unrelated computer error I had). Still, though we're not sure just how widespread the problem is, there were definitely some players suffering from lag and disconnects. Hopefully the problem is cleared up for good.