Mythbusters is awesome, in fact I'm watching it right now...
-It's on the "Discovery Channel"
If you're a comedy/social satire guy you can't go wrong with:
-South Park (animated; takes on a lot of current events)
-The Daily Show ("fake" news show; does comedic looks on current political events but obviously liberally biased)
-The Colbert Report ("fake" news show; does a very sarctastic take on conservative views)
...all on "Comedy Central"
If you're looking for drama or serious shows I hope you have HBO because cable shows suck.