I remember seeing the IMAX edit of AotC when it was in theatres and wishing that it had been the version of the film released to regular theatres as well. The film was considerably better in its edited form, with so much of the painful romantic subplot expunged.
My favourite edit of Episode II remains Attack of the Phantom by the Phantom Editor. An excellent, well thought out and well executed edit. The commentary track is particularly interesting and enlightening.