I was going to buy an iPad for one usage: I have ripped lots of DVD that I own, into ISO files, which I played on Mac very easily. Many of those DVD are lecture and eductional subjects. I want to be able to just copy on to iPad and watch them when I am on the train, travelling, etc. When I went to Apple store yesterday, I was about to buy an iPad, only to find out that there is no simple way watch a DVD or DVD iso file on iPad. I was told that I would need to convert it, then put it in iTunes library, then sync. What would be the simplest way to do this?