iTunes 8 has to be patched, I created a prepatched AMD version, download link is here:

http://rapidshare.com/files/14417454...8_AMD.dmg.html

Another nice free iTunes Plugin is DockArt, it shows the Album cover in the Dock. It has several options.
http://homepage.mac.com/gweston/dockart/index.html
iVirtualize allows to add more virtualizations in a single plugin: http://web.mac.com/vogelbusch/Site/About_Me.html

Say, does the original iTunes virtualizer use so much cpu power like on my machines? In a window of ca. 1300x1024 pixel it needs ca. 50% power. But it's the only one which needs so much.