I'm TOTALLY hooked on that show and so is my wife. I'll be very sad when the season is over. I hope they have some cool extras on the DVD. By the way there is a big story/interview with the cast on 20/20 Friday night if you are interested.
I'd read in a press release a while back that one of the extras is the "un-aired " pilot of the show which features a very different ending-- the death of Jack! Apparently, Jack was meant to die and Kate would then be the relunctant leader of the Castaways. Of course, then Matthew Fox ended up having such great chemistry with the cast that this decision was reversed.
If you're an Alias fan you'll know that Abrams DVD sets don't disappoint when it comes to extras!