Hit triangle to go into the camera options. I see the option, but it is grayed-out. I assume one needs to have the PS3 hooked up to a 3D TV in order for it to allow you to take a 3D photo though.
You need 3D-TV.Then you can switch to 3D photomode (in camera options).They are saved in MPO format.But there is no way to make them in normal 2D as I know...