Dr. Sarah's Futurama Math, from Sarah Greenwald. Apparently a new Futurama DVD was just recently released, if you care about that sort of thing. (Personally, I like the show but not enough to go out of my way to watch it.) The DVD includes a lecture on the math of Futurama. I didn't know that a lot of the writers of the show had serious mathematical training, but it doesn't surprise me at all.
Also, simpsonsmath.com from Greenwald and Andrew Nestler. I like this one more, because I can get The Simpsons but not Futurama on my dirt-cheap cable package, so the Simpsons references are more current to me. I linked to this one a long time ago, but you probably weren't reading this blog then, because at the time I had maybe one percent of the readers I have now.
(In a not-all-that-strange coincidence, I'm reading William Poundstone's biography of Carl Sagan. Sagan was born in 1934, and often cited the "real" Futurama, a pavillion at the 1939 New York World's Fair, as one of the first things that pushed him towards being a scientist.)