To film the event we originally thought about getting cameras pointing at the screen. This personally I thought would have ended up looking terrible, then suddenly I remembered about the new QuickTime player in Snow Leopard which has built in screen recording. Sorted.
Not only would this be easy to record and edit it was all built into the Mac, so it would film the screen input not loosing any quality (but obviously I will compress the file otherwise it will be massive, as it doesn't need to be HD!).
Rich also has a Mac with Snow Leopard so we defiantly have two filming views/angles and I would also be able to borrow a friends mac if needed.