There was this one time when I restore my iPhone without using backup, one application restored all my favorite items without me ever input anything into the application. There's no mention of this "feature" in their product page as far as I found find. While it's useful, it's rather scary that this could be done completely without user acknowledgement.

IMHO, removing UDID access is good, though I would prefers if they introduce something similar to Location Service and let me whitelist which app to allow reading UDID.