My favorite show of all time is "Yes, Minister"/"Yes, Prime Minister."
My favorite American shows of all time are "The Andy Griffith Show" (black and white episodes only) and "Dead Like Me."
My favorite show still in production is "Boondocks."
Honorable mention: "The Daily Show," "The Colbert Report," and Penn & Teller's "Bull****!"
I like "King of the Hill," and I usually watch "That '70s Show." The latter is over, though. It's pathetic; it's like the color episodes of "The Andy Griffith Show" -- just stumbling along because people like the cast and/or characters.
Mostly we watch The Learning Channel, Home & Garden TV, DIY, and the History Channel. No commitment to any one program, though I do try to catch "Offbeat America." But frankly, I spend a lot more time in front of the computer than in front of the TV.