Solved--Halfway!

[calliopes_pen]

It's definitely an issue with Comcast that's blocking CliqueClack, Demonoid, Insanejournal, and That Guy With The Glasses. I had an idea when Comcast was briefly not working. I switched over to Paducah Online's dial-up, and went to each site--through there, I get to them fine. Turn that off, and try Comcast once it was working again, and I can't. But at least I have a way of getting around it!