There is a VNC server that works on the 770 http://www.karlrunge.com/x11vnc/ but you'll have to build it yourself in scratchbox as I've not created a package - I've only just tried the binary I've built.

If you do use this I suggest you use the option "-cursor arrow" and you may well have to run ping or similar in the background to keep the conection alive. Oh, and another ip - use the enter key rather than return, or disable the on screen keyboard if you don't want to use it - I can't remember the command for that though.

That said. The performance is good, so this seems like an app that's well worth having on the 770.