Brightkite 2
Macworld has a piece on the new Brightkite iPhone app. They talk a lot about the service updates in general, but say very nice things about the app specifically.
New, unobtrusive buttons on each post and photo allow you to pick whether only your friends can see it, or whether you share with the public. You can also toggle whether each post gets syndicated to your Twitter, Facebook, and Flickr accounts, offering far more freedom over how much of your location-based adventures leak out to your other friends.
Looks like Tony Hillerson has been doing some great things since taking over as Mobile Developer for BK.