My favourite at the moment would have to be ADM's Revenge of the Sith. Although the original was an improvement on episodes I+II, ADM really sorted out a lot of the weaker elements of the film.

I think STAR WARS - Episode II.I - Attack of the Phantom should be the list also as not only is it a far better edit than the original, but a very well put together DVD.

I think that Superman 3 shouldn't be on the list though, as its not a fan edit. It was edited for TV under the supervision of the Salkinds, where they threw in all the footage they could to beef up the run time, resulting in a lot more crap footage of an already poor Superman film.

As an afterthought, Deleted Magic would definitely be up there in my top 3 fan produced DVD's.