NVIDIA, X.org and transparency
Ever since Keith Packard wrote the composite extension for X, I've wanted to use it. But it has never been useable. Without some form of accelleration, it's excrutialingly slow. And with accelleration (at least with NVIDIAs driver) it was horribly unstable.
Well, rejoice, all who wanted eye candy. NVIDIA has released version 8174 of their Linux driver. And now it's stable with RENDERaccel on. So composite works. It's nice and fast and stable.
Just follow a composite howto (gentoo howto's are pretty good with these things) and enjoy the wonderful world of real transparency and dropshadows. I must say that I'm getting used to the shadows. See for yourself: