I want to show you my first iPhone app. It's called 4sqwifi. I use Foursquare to find nearby venues with wifi and their passwords. We (me and a friend of mine who helped with coding) used Titanium Appcelerator to develop the app. The way it works is that we have a nice little algorithm communicating with Foursquare's API and then brings back the results which are only nearby venues with wifi -- and their passwords as tips.

I think it's an interesting way to use Foursquare, right between social location awareness and everyday life-hacks. If you have any feedback, it's greatly appreciated.

Plus: there's a bug that appears on some of our users that didn't appear on our beta testing (on-device on 4S, 3GS and Xcode simulators). After you login with your Foursquare account there's a chance that our website (as callback URL) doesn't disappear from the screen. In this occasion, you have to kill the app from multitasking and re-open it.

Here's the AppStore download link (it's free!):

http://itunes.apple.com/us/app/4sqwifi/id477172869?ls=1&mt=8