Nerdcore

Nerdcore- Hip Hop concerning nerdy things like computers and science fiction. It's sweet.
Here's some links to check out:
MC Lars' "True Player For Real" was NPR's song of the day today. See the article, listen to the song.
Weird Al was a pioneer of this genre by parodying popular rap songs- see "White and Nerdy", "It's All About the Pentiums", and "I Can't Watch This."