cool design !

what about cutting a 1mm deeper groove, which would be thinner, for when the keyboard is out ? That would prevent the N900 rattling like in the video.
When the N900 is closed, the groove you already cut out holds the phone. When it is open, the keyboard part automatically slides into the deeper groove and is held tight.
I guess you can even do that on the already made stands.

Anyway the only times I would have liked to have a stand were when watching a movie, so I just wouldn't have the keyboard out.