So far, in the prequel trilogy, I've been most impressed by the planet of Naboo as far as new planets go. It's just so rich and beaufitful, and ellegant and heartwarming. It's the homeworld of the Gungans and it's just a unique planet and I'm glad it was a major planet in TPM. It's one of my favorite planets in the entire STAR WARS trilogy so far. My favorite in the PT COULD change after ROTS, but probably not.