XGL has been out for a good few weeks/months now, it was a secret project by Novel, I think I read somewhere its been a number of years in development and is quite a feet when you consider Novel has written a whole new X server and the compose manager. Its considered beta probably even alpha software atm, so isn't stable. Linux distros like Ubuntu have it in there development release (dapper) which is only possible because of the nature of the GPL license :-)
Redhad has been developing a similar product to Novel but uses the standard X server I believe and just adds extension's to it (although Ive not read much about this).
:-)
I use both AOS and Linux :-D
