With the recent announcement of integration between Twitter and Apple's social music networking service "Ping," some observers have noted that the Tweets being generated from Ping are including awkwardly-long URLs.
Some even speculated that Apple would adopt their iTun.es URL to replace long URL's. Well, it looks Apple finally turned to Twitter's t.co URL shortener.
As you can see in the image above a tweet using the t.co URL shortener. It's available on mobile clients such as Twitter for iPhone and iPad.