Displayrecorder available on the App Store.
Cydia, the jailbreak store, has lots of tweaks that are missing on the App Store.
Surprisingly, one tweak made it and escaped Apple´s strict policies, we don´t know how. The thing is that you can now record things happening on your iOS device as they happen with Display Recorder.
Your recordings will also include audio coming from the mic and are saved on the Photos app.
Download it now before Apple pulls it out from the official store. It costs $1.99, available worldwide.