I am trying to get X11Fowarding working over ssh and its seems that the N900 does not have a binary for xauth. I am not sure what package I need to install to gain this. If anyone could please let me know if there is a way (w/o building it myself) this would be of great use. If I have to build it myself I'll probably give that a go. I am not a developer, just an avid linux user.
I have a feeling most apps will not work very well as they are built firstly for the Maemo graphic toolkit, and secondly for the screen layout and resolution. At very least you'll have odd display over X, and at most I would say things won't run at all. I think a lot of the apps are expecting a local only display (perhaps via non-standard graphics calls) and so won't actually forward over X.