Today, Apple released iTunes version 9.0.1. This update offers a number of fixes and improvements to iTunes:

Resolves issues browsing the iTunes Store.
Addresses a performance issue where iTunes may become unresponsive.
Fixes a problem where iTunes may unexpectedly quit.
Fixes a problem syncing Podcasts in playlists to iPod or iPhone.
Fixes a problem sorting albums with multiple discs.
Addresses an issue with the Zoom button not switching to Mini Player.
Improves application syncing for iPod touch and iPhone.
Genius is now automatically updated to show Genius Mixes.
You may download iTunes version 9.0.1 on Software Update on your Mac or Windows PC or on the iTunes download site (Source link)