Late Thursday, Apple updated its two-week-old iTunes 11 with a updated named 11.0.1 (currently only available through Software Update), but which nonetheless restores a feature whose absence was decried by upgraders -- the duplicate finder built into the program. The new version restores the dupe finder, and solves a few teething issues with the overhauled iTunes. Apple's iTunes 11 was the first major rewrite and UI overhaul in the program for over a decade, and has been met with some mixed reviews.
