I must be a total weirdo, I've been carrying my curve, and now my 8820 in my pockets as long as I've had them. Never had an issue with it getting dirty, every now and then I have to pick a little bit of lint out of the crevices, but my trackball still works like a charm.

I do have one of the clip holsters from seidio, which I use ocassionally, but I just don't like having a "bat utility belt" look going on.