Funny I've always worried about the mobile keypads because on top of that they "echo" the character you typed. I'm paranoid and often try to shield the screen when I type in my password. That said there are so many cameras everywhere it's hard not to think that somewhere they got a good clean shot and could figure out my password.

I don't use the same password on any two things so it's less useful to get my mobile lock password then it might be for some but if you have a lock screen pin or password you do get an amazing amount of stuff for free on a person's mobile device...