Turn to deal with the display...

Dave from http://superdave.blogdns.org/superdave suggested this to make the
resolution 800x480

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As for xorg.conf, I added the following to the "Monitor" section:

Modeline "800x480" 44.32 800 832 1000 1032 480 489 496 505

And then simply added "800x480" in the modes list for 24 bit color.

Note that doing that got me 800x480 in GDM, but as soon as I logged in GNOME
would switch to 800x600. To make GNOME cooperate, I had to do the following:

gconftool-2 --type string --set /desktop/gnome/screen/default/0/resolution "800x480"

Note that I'm using the VirtualBox X.org display driver so I have no idea if any
of that will work with a *real* video driver. Let me know if it works
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But I'm afraid this doesn't seem to work here. When I put those lines in the
xorg.conf I get a message in the Xorg log saying that resolution is not
supported and then going to 640x480 ....

If anyone got this working in a non-virtualized envirnoment, please let me know.

Cheers