This was disturbing to me as well.
I love the curve since it's so thin, but the holster adds bulk in my pocket.
I reassigned the PTT button (which I don't use) on the side to be the 'lock keys' command. That also turns off the screen.
True, I have to unlock the keys when I want to use it again, but thought this was worth posting as an alternative to using the holster. (since the red button doesn't turn off the screen like it did on my Treo).
Noob here, so excuse me if this has already been posted.
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