update: the app is now pulling data from the live site, hopefully this will give much better results.
As a remote iPhoneDevCamp participant, I finally got my little hacked together app up and running - announcing the City Explorer. It could use a lot of work still, but this is a 1.5 days worth of messing around. Basically you can add your own cities to it, then it goes and asks Platial for the most common tags in that city, clicking on a tag brings up 20 Places with that tag in that city, each one links off to the native google maps app on the iphone. More info about the Places is coming, images, descriptions, clickable phone numbers, etc. Anyway, play around with it on your iPhone.
The link to start without any prefilled cities is http://0009.org/i - the app will likely be ported over into Platial once it's up to par - so this url isn't the most permanent thing.