The Cell processor from IBM is probably best known for being a core component of the Sony Playstation 3, but there was a time (however brief) where we all though that it form the core of the next Mac, before Apple made the momentous decision of using Intel CPUs instead.

If you want to make use of the power of the Cell then you might want to check out the new series on IBM developerWorks, Programming high-performance applications on the Cell BE processor, Part 1: An introduction to Linux on the PlayStation 3. This promises to be an excellent guide to programming the Cell for your own nefarious (or otherwise) needs. Sadly I don't have a PS3 (I'm waiting for a Wii to be available), and I doubt the budget would stretch to one of these. Donations, of course, are always welcome!