As readers of this site know, my current favorite "new" standup comedian is Lewis Black. Comedy Central has two old half-hour shows in which he performs monologue material and they're running them this Friday night. If I understand the schedule correctly, they're running one at 8:30 PM. Then they run the other at 10:00, followed by the first one again at 10:30. Subtract three hours from those times for Pacific. Anyway, taping or TiVoing for an hour beginning at 10 PM (7 PM, Pacific) should get both of them. They're not as good as seeing him live but they'll give you an idea of what you'd experience if you did.
Black is currently on tour, as itemized over at his website [WARNING: Overly-fancy graphics that make it difficult to read]. He also has a major HBO Special that debuts May 15 which I expect to like a lot.