Just a brief remark on the 'end duels' -- aside from saying they work really, really well even at a rough cut stage, there's one note that struck me. I realise the reasons it was done, and you've got Obi-Wan's remark that "I will do what I must" to justify it, but Obi taking out Anakin's legs when Anakin was trying to save his own life is actually on a bar for sheer low-blow value as leaving the poor bugger to burn was. I mean, wow, that takes the phrase "attack of opportunity" to a whole new level.
On the other hand, thinking about it, I actually like it. Obi-Wan's not portrayed as a complete goody-two-shoes through the movies anyway; after all, he does wind up terminating a lot of sentient beings. It just had a big impact, that's all.