I thought that was a bug the first couple of times I used it, but then realized how clever it was to be one-use-only. If you want to reconnect via VNC again, you must start X11VNC again. Since X11VNC doesn't ask for a password, this is a sort of brute force security feature as well as power conservation feature.

While fooling around with VNC viewer clients for Ubuntu, I found that Remmina starts out OK, then the remote cursor disappears. xtightvncviewer is the only one so far that has consistent performance.

I also would like to see X-forwarding fixed. It would open a lot of possibilities for use of the N900 driving in-car information systems, etc.