Over at The Complete Geek my friend Jered posted a really nice howto on remote X11 forwarding the other day.

Like uses of Synergy, remote X can be extremely useful when you’re working with multiple machines, or even if you’re working with a virtual machine and need to run some of the applications on the host without constantly flipping windows back and forth.

Jerome Glisse announced today that a small team of X.Org developers has managed to provide the initial support for ATI R500-based cards (ATI Radeon X1300 up to X1600 at the time) by reverse engineering. The released code is definitely not yet ready for the normal users, but it's the big step ahead nevertheless.