I think Call For Help has been cancaled; that was the last I've heard. Leo and "the gang" can be found at twit.tv and Patrick Norton is at revision3.com/tekzilla--those sites have enough shows that would last for days.
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Also has a nationally syndicated radio show heard Sat and Sunday at 1pm-4pm eastern - it also plays on XM for sure (I listen) and I believe Sirius now with the merger as well. They replay the Sunday show on Wednesday from 4-7.
The closest thing to TechTV these days is Revision3. They have a bunch of different web-only shows with quite a few familiar TechTV faces. (Kevin Rose, Patrick Norton, Martin Sargent and others) Definitely worth checking out.