the nes emulator is probably the least appealing thing for jailbroken iphones.
i can now see my battery life in actual percentage, place 5 icons on the main dock rather than 4, see my calendar/incoming emails/sms right on my lock screen, increase the overall volume of the iphone, delete individual calls from my history, custom sms tones, have a camera app that can zoom in and out along with tons of other features, can now record video, etc etc tons of random stuff.