I bet 'gifting' people in your Ping friends network with music (and apps, books later on) will be a profitable feature for Ping, when Apple implements it.
Funny because I meant that in the sense that simonsquiff didn't mention the books in his comment, but you're right.
When gifting right now, I don't think you have any way to know if the recipient has or not the song/app. I haven't gifted songs too much, so I'm not sure what happens in that case. Ping might be able to avoid this situation.
Gifting will do away with those Apple vouchers you can buy to the vale of 10 bucks or whatever for your friend. Instead, you can get them the song directly.
A ready-made social network, all the network infrastructure in place, users with credit cards at the ready, owned by a highly successful tech multinational....the recommendation on APPL is 'buy'!
I bet 'gifting' people in your Ping friends network with music (and apps, books later on) will be a profitable feature for Ping, when Apple implements it.