I also hate what they did to Boba Fett's voice. The other bit that gets me is in ESB where Vader's very abrupt "bring my shuttle" was changed to some long sentence about telling his star destroyer to prepare for his arrival, just so they could squeeze in another shot of a spaceship.
On the release of the originals on Blu-Ray, I'd be happy with them doing subtle changes, like to remove matte lines, or tweak the lightsaber colours, say, but nothing more. I think I could stretch to including the updated Emperor hologram scene in Empire, but keeping the original dialogue.
(Speaking of the Emperor, I thought the makeup job on him for Ep III wasn't very good - not at all close to how he looked in ROTJ.)