Flickr is almost certainly the best online photo management and sharing application in the world. Show off your favorite photos and videos to the world, securely and privately show content to your friends and family, or blog the photos and videos you take with a cameraphone.
A people search application for the iPhone that lets you find the people you are interested in. Uses the Spock people search API. This link goes to the iPhone App Store.
Weaves real-time, geographically matched user comments from Twitter that provide perspective on the temperature. Also integrates a clothing advisor to show you what people are wearing in your specified location. Link goes to Apple iTunes.
