I just finished downloading the Part 1 (early screening).divx.avi today and saw it and I really like it so far... really tight!
This is a few things I would consider doing (besides my majorly awesome sugestion of ghost-rotoscoping Neeson out )

I know you have featherd all the swipes and transitions already so that's moot.
Another inconsistency from the Prequels that makes me dislike them so... in the Ep. IV Ben says to Luke that he has not gone by the name of Obiwan since "Oh, before you were born".
I wonder if there is a way to change it in your Prologue so that everyone calls him "Ben" Kenobi instead -- at least during the time of the Jedi Purge. I know it may be impossible to do but its something to consider ... and I can dream can't I?

There were scenes during the Jedi purge where more Jedi are being killed (like the Twi'lek Jedi Aayla Secura) I think you should include them. It makes the purge seem bigger, more widespread.
I also think you should use more "starwarsy" font for the time stamp text during the fadeouts. Maybe the same as the opening "A long time ago in a Galaxy far, far away ...". The reason i say this is that in Star Wars proper this is the only time descriptive text appears on the screen aside from the opening crawl. Maybe it would be a good idea to stay consistent with the opening text.
Oh, one last thing the dialog is so bad in these prequels ..., I hate that close-up on OB1's face during the Grevious duel, you know, right when Grevious says "..you're doomed!" and then OB1 replies with the brilliant ingenious retort "Oh, I don't think so!" Leave Grevious and remove Kenobi's close up and his bad reply and I'll be your best friend.
