I did - and it works great. The WMV components for QuickTime... Free...
http://www.microsoft.com/windows/windowsmedia/player/wmcomponents.mspx
I have an iBook G4 in which I have put in an additional 1 gb RAM. I have the latest 10.4.8 OS.
Problem is, when I go to a site like youtube and try and see a video, it does not stream continuously but is jerky.
This, when I am not doing anything else on the laptop.
Any hints/guidelines to help me see my videos properly?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic