Got a chance to watch ANH and ESB yesterday, and hopefully ROTJ tonight or this weekend. I'm glad to see that many of you have been noticing the same things, feeling the same way about the DVDs as I have. I agree with what Scott said, it was like watching new movies for the first time. I kept commenting to my wife throughout both movies that I just couldn't believe how different, clearer, and better the movies looked.
I also noticed so many differences on Dagobah. To me the whole planet and scenes on that planet seemed to be cast in a muddy brown color, but on these new DVDs, everything stands out so well. Yoda is more color defined, and all the greens that can be seen in the Dagobah environment, everything just looks so nice.
To be honest, the changes I have seen so far in the first two movies haven't really bothered me. I would have been fine with them leaving Boba's voice alone, but I guess it doesn't sound terrible. The new Emperor scene, while the dialogue could have just stayed the same IMO, is probably an improvement visual-wise. The new hologram looks better I think. Jabba in ANH looks better than the original SE version, but still seems like they could do better than that. While the Jabba doesn't look terrible, it doesn't look like the ROTJ version...and that sort of bothers me.
Anyways, little quibbles and changes aside, I am so happy to have these on DVD. The movies truly have never looked better, at least of the ones I've seen (ANH and ESB), the sound is improved, and it is just a great way to enjoy my favorite movies of all time. I keep saying it, but it is just amazing to me how different the movies look from the SE VHS tapes I bought (just a couple years back). A great improvement, and I'm looking forward to watching Jedi soon too.