Serendipity apps

I’ve just discovered that Adam Greenfield curated a great collection of iPhone/smartphone apps which create and/or facilitate serendipity in an urban context for last year’s Future Everything festival.

I particularly like Phantom City — a collection of visionary architectural projects for New York City which are unlocked one by one when users of the app visit the site. It’s precisely the kind of thing that geo-location services like Foursquare could be doing more of. If anyone knows whether there’s one for London, let me know.