Apple has released an update to iTunes via Software Update.
iTunes 10.6 adds the ability to play 1080p HD movies and TV shows from the iTunes Store.
This release also includes many improvements for iTunes Match, including:
• Improved song matching
• Improved album artwork handling, downloading, and display
• Addresses an issue where songs may skip when playing from iCloud
For information on the security content of this update, please visit: support.apple.com/kb/HT1222
You can install the update by selecting Software Update from the Apple menu at the top left of your screen.