At some point, they added in Twitter integration, so if there's a tune you want to share that way, you can do so. There's always been a way to share them via email, too, and they've spruced that up a bit by calling it a "postcard" (conveniently also giving your friends a chance to buy the music you hear, and probably put some change in Shazam Entertainment Ltd.'s pocket -- it is a free app, after all). But the most interesting new feature is that Shazam now tracks your location when you "tag" a tune, so that eventually, you'll be able to look at a map of where you found all this new music you like.
Sure, it wasn't exactly a pressing feature, but it is cool to see your "musical journey," and have that information about not only what you tagged but where you tagged it. Shazam is an app that's probably on your iPhone already, but it's worth another look.