I just got the new Iphone 3Gs and I've started looking for a usage meter. My concern is that for these to work I have to give them my account username and password. I've got no reason to believe that any of the apps I'm looking at are suspect, but I was wondering if there's some way of being sure this information isn't being sent elsewhere. Does the appstore approval process take care of this or is it a matter of faith, in which case I'll just check manually.