Flook is another one of a growing number of location based services like Foursquare, Loopt, Gowalla, etc.
With Flook, you make "cards" out of the places you go - snapping a photo with a caption. Cards can be places, sites, bars, etc, and you can then browse other cards that others upload. It's a user generated database of photos with location associated with each.
The UI is pretty neat, though I had issues with some basic tasks like searching for people I know on the network, and getting the iphone app to remember that I was logged in. I tried creating a card for Coit Tower using a photo on my camera. It worked fine, but then the app assumed the card I created was in the same place that my phone was located at the time of creation. So Coit Tower has moved from North Beach to the Mission.
