Hi I am considering buying an iPhone 4. However I wondered if anyone could advise me about the following: 1) I understand it is able to record HD video. Is the quality suitable for burning to DVD for playback on a TV? 2) How many GBs per hour does HD video at full quality, when recorded on the ipHone 4 take up. 3) How easy is it to transfer video from the iPhone to a mac, for editing in iMovie. Will this still be HD quality? 4) How long does the battery last if recording HD video on the iPhone? I understand it runs it down very quickly. Any help will be much appreciated!