I think Apple has finally swept away all the hopes of iPhones hackers with this update, but it seem it also has some great new features, according to Apple:

With iTunes 7.4, sync your favorite music and more with the new iPod nano (third generation), iPod classic, and iPod touch, plus create custom ringtones exclusively for iPhone with many of your favorite songs purchased from the iTunes Store. You can now also play purchased videos with closed captioning (when available), easily rate your favorite albums from one to five stars, and watch videos at a larger size inside the iTunes window. iTunes 7.4.2 addresses an issue with creating ringtones using iTunes Plus song purchases and includes bug fixes to improve stability and performance.

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