Decent windows Screensavers

Anyone know of any? I love the stuff I see on the unix computers here at school, but I'm not about to partition my laptop's harddrive just so I can have nifty ubuntu screensavers. Got anything interesting for Windows? Preferably related to Math/Computer Science

www.opera.com

Why want a decent screen saver if your not gongi to see it? presuming the reason the saver comes on is because of absence from PC.

Set it to turn off the screen (better yet, turn it off yourself when you're not using it).

http://www.electricsheep.org/
Distributes generation of awesome-looking fractals to each client. Need to wait a few hours for the first ones to appear. If you have a shitty overheating laptop, you can leech without whoring your CPU.