I think you will find that over time, lint will work its way into the spaces between the screen and the frame, and between the buttons. The track ball on other models seems to collect a lot of gunk, but I suspect the Storm will have its own issues.
I think some type of a holster would be a good idea, even a sunglass bag or something... to keep the lint at bay.
If a BlackBerry goes to sleep but nobody is there to see it, is it really asleep?