Great quote from Matt Drance on Ping:
It’s interesting how much more polished the Ping UI is on iPhone than on the desktop—a testimony to where Apple thinks the money is. Whether you’re standing in line, sitting in an airport, or on the bus, Ping will help you find music with more confidence, and in less time, than ever. The desktop UI, by contrast, looks horribly rushed, and not nearly up to Apple’s usual standards for a demo, let alone a shipped product.
(Read more on Apple Outsider)