'Penn and Tellers:Bullshit' on showtime is classic. My new favorite. It has tits and intelligence!!! Penn calls people out on their own bullshit and topics cover anything from the ADA, the female form, patriotism, exorcisms, obesity, Wal-mart, and nuclear energy. I literally fell off the couch laughing over one episode.
Dexter is also a good Showtime series.
House, CSI, Southpark, Mind of Mencia, The Daily Show, The Colbert Report, PBS, The History Channel, and Heroes are all good.