Like Siamese twins, the iPod and iTunes go hand-in-hand. This week’s iPod update, then brought a whole new version of iTunes, v10, with a new logo and a few new features.

The new icon abandons the old CD imagery and replaces it with a bulbous double-clef note in a blue circle. The features include music clean-up – select five or so songs from the same album and it automatically finds art and titles – and there is a new discovery feature with social aspects called Ping.

Ping allows you to share with your friends what you’re listening to and even share information on concerts and events. It includes a custom “Top 10″ list and artists and listeners each have “profiles” that consist of interesting news and selections from that user’s library. It is true social music discovery.

Profiles can be public or private and you can limit access to a certain “circle of friends.” Ping is available now to all iTunes users and allows for multiple forms of sharing including image and link posting.