For many matches, The Blue Alliance has .mp4 versions of archived video. This format is playable on iPhone OS devices. If you are interested, you could tie in with The Blue Alliance API to offer replays. PM me if you want more info
Also, any chance of releasing the source code? I'm sure many people would love to see how an iPhone app works, and Apple's NDA on code no longer prevents open source projects. It could be a great learning opportunity for everyone.