Compiz has been around for a long time. There was a forked version called Beryl that I used for a long time that was very popular. The two projects have merged again and this is what they have produced:
For those of you who don’t know, Compiz Fusion is a composition window manager for Linux. It will run on basically any GUI (Gnome, KDE, etc). The purpose of Compiz Fusion is to make the graphical user interface more fun to use at the same time as making it more productive.
This project is still in an alpha stage, which means it is not stable or ready for the general public. You can still download and install it on your Linux though, just don’t complain if you have stability issues. Hopefully they can work on getting this to a stable state now. I’d really like to see that.