Apple has released iTunes 11.0.3 which offers several new features and improvements, including:
• New MiniPlayer. MiniPlayer now includes a beautiful new view that showcases your album artwork. In addition, a progress bar is now built right into MiniPlayer.
• Improved Songs View. You can now enjoy your album artwork while in Songs view.
• Multi-Disc Albums. Albums with multiple discs now appear as a single album.
• This update also provides performance improvements when searching and sorting large iTunes libraries.
For information on the security content of this update, please visit: support.apple.com/kb/HT1222
iTunes 11.0.3 is available via Software Update and also as a standalone installer.
More info and download link (OS X (187.50 MB) Windows (84.98 MB) Windows64 (86.70 MB)) here.