Flight of the Conchords are a "folk parody" duo -- they remind me of kind of a modern version of the Smothers Brothers. They have a series on HBO, of which I have seen 1/2 an episode and thought it was inspired. This song* is pretty representative. (Thx to Nerdygirl and Erik.)
This (Barats & Bereta) always warms my heart.
Q: What's the difference between Canadians and canoes?
A: Canoes tip.
Q: Why couldn't Hellen Keller drive?
A: Because she was a woman.
*Children alert: song has one F-word.