I've been advocating these for months. They provide the protection you need, while allowing you access to the device (granted, you still have to be careful not to impale the screen).
With the N800 and N810, the big kickstand worked well as a "safety handle" to slip your fingers through. The tiny kickstand on the N900 probably doesn't work that well.
But, I wonder if there's a wrist strap mount/hold on the N900? If not, I wonder how obtrusive it would be to put a loop through the kickstand, that you can attach to your hand.
