I'm running vncserver and viewer between a windows laptop and a Ultra 20-x86 dual-booting Solaris 10 and Fedora Core 4. It's cool but have had a problem getting x2vnc (virtual viewer) to run on my Sun box, so i can manipulate my laptop...
Unfortunately, I don't know much about VNC at all anymore, though I used to use it years ago when I supported lots of windows systems. Hadn't even heard of x2vnc.