I woudn't know where else to put this, I hope it's cool to promote a payed utility here – to be clear I have no affiliation nor involvement with the project.
Since there are a few developers working on mobile platforms around here, I thought this could be useful to share.
Reflector is a software for your Mac that enables to mirror your iDevices to your screen via Airplay, record the video stream (with audio too).
It might come in handy to put together material for a portfolio or promote your indie project cheaply.
I used it myself to record some gameplay for one of the mobile games I worked on (the result
https://www.facebook.com/ReflectorApp
There are other similar apps, but this seemed to me the most solid.
I'd prefear to do this with a physical cable, but video acquisition hardware is more expensive.