I forgot to post about freenx lately. I'm starting to get involved in the Ubuntu community and got sidetracked creating a wiki account to help out.
Dapper works great with freenx. I'll have to try out freenx and xgl when I get a chance but I'm pretty sure all 3D graphics are not available through freenx.
Don't forget to pick up a Windows client or payed service for a Citrix replacement from http://www.nomachine.com
technorati tags: FreeNX