I've just finished re-watching 24 Series 1 on DVD - it's taken me a little over a week, ploughing through a few episodes a night.
Some parts dragged on a little bit but it was all pretty watchable the second time round, made easier with the great storyline and superb acting.
I checked out the 'alternative ending' and am glad they didn't use that - I would have been so disappointed and think I would have felt somewhat cheated by such a poor ending.
Season 2 is still wrapped up in cellophane - I watched most of this series on TV but not the last few episodes. Think I'll give myself a break (of a few days maybe...) before immersing myself in the world of Jack Bauer again...