I've got a quite neat method now. I use a book end (that you use to support books on a bookshelf, a thin bit of metal basically with a 90º angle) to support the iPad vertically (you could do it flat, that doesn't work for me). Then I use an iPhone 4s for recording, mounted in a car windscreen holder, which is attached to a glass plate (taken from a picture frame). It's easy to get everything in just the right position, can be moved easily, and is pretty good and clear.