After NCIS and The Unit, one of my favorite weekly shows is Numb3rs. Only on American TV can a math geek catch criminals and score chicks! I also like the offline learning community built around the show, providing teaching aids based on the math techniques used in the show.
If you are a teacher, you might want to check out the blog here. Each episode review has a set of learning activities along with links to other activities and additional information.
The Algorithmist 
I love that show! They have great female characters too! And they score dudes 😉
Apparently, the folks at Wolfram Research are now consulting on the math used in the show. It was mentioned in the last newsletter I got from them.
Kristen – that’s very interesting. There is also a book out about the math used in the show. I saw it once at a bookstore – pretty high level, so its readable by a very general audience.
thanks,
– jim