Compiz Fusion is alpha software for the Linux desktop, and it is radically changing. It is strongly recommended that you make backups of all important data before installing it on your system. Furthermore, do not install Compiz Fusion on important production machines, such as servers, business workstations or other systems where uptime is crucial; Compiz Fusion is likely to crash or even lock up your system at least once. It is, however, suitable for normal desktop use. In the event that Compiz causes system failure or data loss, you will need to know how to recover your system.
The following are links to your distributions' installation guides'. It is a good idea to try and follow these first, as they are more tailored to your distributions' default setup, and you will therefore have more success with them. They involve the use of using your distributions' package management system and their repositories. The version of Compiz Fusion they offer will vary from distribution to distribution.
Sabayon (working out of the box)
You may also find user-compiled packages and guides to compiling in the Packages, FAQ's, and How-To's section of the forums.