Earlier today, ahead of iOS 4.2 launch, Apple updated the backend of the iTunes app for iPad to include support for Ping. Once you've authorized Ping in iTunes 10 on the Mac, you can access your stream through a Ping tab at the bottom of iTunes app. Just like the desktop version, Ping for iPad integrates with Twitter and automatically tweets every time you like or post something on Ping.
You can like and post songs available in the iTunes Store (sadly, there's no way to integrate Ping with the native iPod app), check on your profile and see your activity. There's also a concert-specific section that shows local concerts, bands on tour and links to purchase tickets on ticketmaster.
Ping integration in iTunes for iPad suggests iOS 4.2 is really around the corner now, as we reported when Apple released the second GM build of iOS 4.2 for iPad last night.
Check out more screenshots below. [Thanks, Tim]