NoMachine recently released their NX server as OSS (Download). Now you can get similar terminal server (X11, VNC) performance as previously only Citrix was able to deliver – for free!
The performance gain is impressive (review at Orange Crate). Using NX, you can access your X11 desktop even from a Sharp Zaurus or a HP IPAQ..
Need to install it ASAP. Conveniently, there are already Gentoo ebuilds for NX :)