If you’re shooting in RAW, you don’t need to worry about the white balance (leave it set to Auto, you can always change it later in Photoshop). But, if you’re shooting in JPEG Fine to get more shots on your card, you’re better off choosing a preset white balance in the camera that matches the lighting situation you’re shooting in. That way, the overall color of your photo will look balanced for the light.
Adapted from The Digital Photography Book by Scott Kelby (Peachpit Press, 2007; $20)_