Bah, I got part way through making this as an iPhone app and this person beat me to it :P
Seriously though: nicely done, UX here is better than what I came up with.
An iPhone version which used both the front and rear cameras would be far cooler than this, and provide better control too.
Call it Cameramin and you’ve got a customer. ;)
So many folks in the thread, myself included. Really fun type of project.