In order to easily see which badges we still need to work on, I'd love it if the display could be similar to Foursquare. It shows you all of the badges available, with a placeholder image in the ones that haven't been earned.
imageshack.us/photo/my-imag...
This would be very helpful in figuring out what I've accomplished and where I need to go without toggling between my earned badges and the list of all badges.