I noticed the strange Yoda voice too. To me, though, it was mostly in TPM. It's like they wanted to do the strange little creature voice used at the beginning of ESB because it was fun and memorable, and then they tried to combine a little of the seriousness, and it seems a little bit of the Muppet voice got in there too. So Yoda sounded like a squeaking Muppet disaster in that movie. He got better in its sequels, though, but it still wasn't quite the same as the original, and I guess that is simply because of the voice aging. I really don't see why in the world you'd want him to re-record those lines, though, Adam. You make my head spin sometimes.