The feature Nokia Camera Extras has, are
- Action Mode
- Self Timer
With the first one you take a couple of photos and then you can change the faces of your friends to the best one. For example on the first picture Anna smiles, but Tim doesn't, and on the second picture Tim smiles but Anna doesn't. So you can change Tim's face on picture one to the one of picture two, so that on the finished photo everybody smiles.
You can find the application in the Marketplace under 'Nokia Collection'.