Revenge of the Sith: the Cliff Notes
Thanks to IMAO (and Carnival of Comedy) for the link to...
If you don't have the time or even the remotest desire to see the movie, but do want to be able to discuss the movie intelligently, then this may fill the bill for you.
Warning: if you are a rabid fan, this may be a bit much. If you are a fan and plan to see the movie soon, spoilers are abundant.