Apple's much-anticipated "It's Only Rock and Roll" event took place this morning, and it included major announcements in the iPod and iTunes families. Here's a list of notable news.

• Apple has released iTunes 9. New features in 9.0 include Genius for playlists, iPhone and iPod app management, Home Sharing, a redesigned store,improved syncing options, a totally revamped iTunes Store with Facebook and Twitter integration, and iTunes LP, which bundles high-quality liner notes, photos, and more with albums that you purchase. There's also iTunes Extras, which is like DVD special features but for movies you buy or rent on the store.
• Ringtones will be sold on the iTunes Music Store for $1.29 each.
• The 5th generation iPod nano launched. It has a 2.2-inch display, a video camera, a microphone, VoiceOver, an FM tuner, a pedometer, and Genius support. The 8 GB model costs $149 and the 16 GB costs $179.
• The iPod shuffle 2 GB is now available for $49, and a 4 GB Special Edition made from stainless steel is going for $99.
• The iPod classic has been upgraded to 160 GB from 120. Its price remains the same at $249.
• The 8 GB iPod touch is now just $199. It's topped by a 32 GB model for $299 and a new 64 GB for $399. All three models now have improved OpenGL ES 2.0 graphics processing capabilities for 3D games. EA announced Madden NFL 2010, Ubisoft announced Assassins Creed 2, Gameloft announced a Halo-esque first-person-shooter titled Nova, and Tapulous announced a racing/music game called Riddim Ribbon.
• iPhone and iPod touch OS 3.0 is getting a minor upgrade with — wait for it — OS 3.1. It adds support for the above-mentioned ringtones, and also lets you run the Genius algorithm on your app selection.