For the more mathematically inclined, there's a really nice little book, "The Computer as Crucible" by Borwein and Devlin, about experimental math. It makes a really convincing case, that I think couldn't have been made 15 years ago, that computers really have something essential to contribute to mathematics now. I think Borwein has written a number of articles about the same, and Devlin had a column in the AMS Notices about computer math.