Aussie Chris Lilly did a thing called "Summer Heights High" which was quite hilarious. I hear a part 2 is in the works.
http://www.hbo.com/summer-heights-high/index.html
http://www.hbo.com/summer-heights-high/index.html
Nice one with Tim Lehrer. That reminded me of a special that Jim Morris, the American President impersanator, did in the 80's starring his version of Reagan. It was about an hour long, and had so many awesome hilarious songs in it. Forgot the name of the show.
In with Flight of the Conchords:
So many classics, even the live stuff.
a Zappa search will ... yield funny songs