I'm still trying to make screensavers from any kind of video.
New power toy just released today:
Windows XP Video Screen Saver PowerToy



The Windows XP Screen Saver PowerToy makes it easy

to play any Windows Media® Video or series of videos

(such as home movies created with Windows Movie

Maker 2) as your Windows XP screen saver.
Link
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-Rob Riccardelli
80GB 16MB MK2 090000736