Just last night I watched ANH after seeing ROTS. While GL did an excellent job of connecting them, IMHO I believe some changes are in order:
1. We need a scene with Sidious in there. Sure, he's mentioned, but for him to have such a large role in ROTS, then not to see him at all is quite odd. Maybe a scene at the end, on Coruscant after the destruction of the first death star?
2. The fight between Obi and Vader needs to be redone. Okay, I know they are old, but still to go from jumping at each other to hobbling around is quite a transition.
3. I'd almost like a mention in the title crawl that 20 years have gone by.
4. Maybe the dialogue should be revised during the duel to highlight their former relationship.
5. The stormtroopers, or some of them, should have Temura(sp?) Morrison's voice to keep the idea they are still clones.

Other than that, I thought it was very well done, and enjoyed watching the second part of the saga in a new light.