"Locative social media is especially interesting because it directly affects how people move through the city. It can be terrifically fun and useful for people who fit its prescribed social model." This kind of proscription (or encouragement) of behaviour is interesting, and I think there are a variety of ways to do it "sensibly". And: how did you expand the group of "people who fit its prescribed social model"? Small changes of behaviour, amongst larger groups, are much, much more interesting.

"A few weeks ago we released our shapefiles via the API, and while most people were excited, some folks were a bit confused about what it all meant. Which is why Tom Taylor’s beautiful Boundaries application is so exciting. It helps you visualize the Flickr community’s twisty changing complex understanding of place." Tom is on code.flickr.com! Hurrah!

"Turf Bombing is a location-based turf battle game which rewards and encourages traveling and learning about different neighborhoods." Location-based game that forces you to travel out of your normal areas, and potentially explore transport networks. Also: not designed around specific devices, just laptop+wifi.

"The Geoblogomatic is little machine that turns blogs into maps. It's in beta" "If you have a blog about places, or things in places, the Geoblogomatic can make a map of your blog posts." Awesome. Another fun thing from Tom.

"Diaroogle helps you find quality public toilets from your mobile phone. It's for the discerning, on-the-go defecator who is brave enough to use a public bathroom, but still demands a hygienic and private bathroom experience. It is also a community authored database of New York toilets."

Collaborative mapping and annotation of skateboarding spots. Nifty - and I quite like the Ferro-esque type everywhere.

"Literature is inescapably intertwined with our everyday environment. By making this visible, we can encourage and spread it, and send it in new and exciting directions."