House

What a genius show! Apart from the uninitiated assuming it is some sort of DIY show (full name should be House, MD), it's the surgical sieve turned into a tv programme. And best of all there's enough detailed medical content that you can call watching it revision.
I also particularly like the fact that House seems to be a specialist in everything, and that his "Diagnostic Medicine" residents are not only incredibly knowledgeable, but also do all the surgery themselves.

But seriously (geeky comment coming), it's the detective novel come full circle. The archetypal detective, Sherlock Holmes, was based on Conan Doyle's Medical Professor at Edinburgh Medical School. Now the medical drama has become a detective story. Just remember to watch it with your medical dictionary to hand.