Software glitch enables protrait mode on Nokia N900

As you probably already know, the Nokia N900 supports portrait mode only in two applications, the phone dialer and the photo album. Nokia already announced that an upcoming update to Maemo 5 should enable this rendering mode across more parts of the OS. In the mean time it seems that a software glitch actually makes it possible to uses the phone in portrait according to the following video posted by Guyver on the forums.

I probably cant recreate it again, but i just tilted the phone to launch the phone app then slide up the screen and closed the phone app.