Oh, of course there are... What about setting up "profiles" within the contacts app for everyone you know? (Of course, better yet, what if they were propagated by Facebook/other Social profiles, etc.?) Now, imagine walking around a shopping mall one day and you get a notification that it's your significant other's birthday tomorrow and it maps out all of the local record stores (one of your significant other's interests is music), especially the one that's 10 meters away in the shopping mall... Score!

Concerning "previously downloaded content," I sort of already touched on it a bit when speaking about "media" (e.g., photos taken, video shot, music listened to). This could definitely be translated to downloaded content. The only issue is retrieving some sort of standardized meta data from that content -- that is, unless the user took some time to tag each downloaded item (highly unlikely and definitely too much to ask of end-users).

Thanks for stopping by!

Tim