I just installed PCLinusOS 2007 as a dual boot with Windows XP. I am enjoying the learning curve, and am trying to bring along some familiar things over from the darkside.
Is there a marine aqurium screensaver, and does wine work with the windows version?

No idea if wine works with Windows screensavers. There is a 3d screensaver in the xscreensaver-gl package with 3d sharks and whales swimming around, but it's very crude looking compared to that aquarium screensaver.

For the most part, xscreensaver's screensavers are individually unimpressive. However, it does have the ability to randomly switch screensavers periodically (e.g. every three minutes). This variety actually makes xscreensaver pretty fun to watch. Any one screensaver gets boring after a while, but when the screensaver switches every minute, it's more interesting.