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The official Flickr iPhone app is finally here and it enables you to easily share the photos you've captured with iPhone's camera, geo-tag them, and add them to sets.
You can also search for photos and videos (yes, Flickr also hosts videos, in case you forgot) from other users directly from your iPhone, comment on them or make them your favorites. In a word, it's probably the best Flickr experience for the iPhone so far, beating all those unofficial Flickr apps we've seen.
Get the Flickr app for the iPhone for free in the App Store.