I was just thinking that something like this would be a great addition to the PSN the other day.
I sometimes use a webcam with Skype when playing with some friends on the PC. It works in a similar fashion, with a small window showing my friend in the corner.
What's also great is you can turn the webcam around and point it at your TV. So in a multiplayer game you can see your own screen, then have your friends screen displayed in a box in the corner.








