Not really an important thing, but I've just found a site that tells you how to add subtitles to a movie that you can turn on/off at will (ie not burned in).
It's quite a quick process as well. But, you do need a Mac (or at least OSX) and you do need to download the iPhone or Mac SDK (the iPhone SDK includes both), which is around a 2 or 3 gig download.
http://www.macosxhints.com/article.p...09081913171253