I have moved from being a dedicated Microsoft Windows user, into a fanatic Mac OS X addict.
My latest spare time sponge is Linux. In particular the SuSE Open Source desktop operating system. The main reason for this switch is the jaw-dropping effects available with my NVIDIA graphics card.
I tried installing Fedora Core 6 but compared to SuSE 10.1 it just did not have the kind of feel and all-round satisfaction that SuSE gives.
If you use SuSE and have a compatible graphics card, Christmas has come early. For an introduction on the effects, using the XGL features you can visit http://en.opensuse.org/Xgl. Check for your graphics card before trying to set this up
Another good read is at http://en.opensuse.org/Compiz.
The compiz homepage is at http://www.go-compiz.org/index.php?title=Main_Page.
Will post back some more after further testing.