Facebook

Facebook

This was an essential app from the get-go, and it's been steadily evolving—like the site—for the last year. Version 3.0 was a total refresh, and supports nearly every one of Facebook's sprawling features, sometimes better than the site itself.

The new, panel-based interface takes a little getting used to, but once you're acclimated to it it's the most effective way to throw yourself, fingers first, into the black hole timesuck that is Facebook.

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From the App Developers: Facebook for iPhone makes it easy to stay connected and share information with friends. Use your iPhone to start a conversation with Facebook Chat, check your friends' latest photos and status updates, look up a phone number, or upload your own mobile photos to Facebook while on the go.