I always hear of people Exposing for the sky and the Ground...
How do you do it?
Camera model: NIKON D40
Date/Time: 2006:12:31 14:50:59
Flash used: No
Focal length: 19.0mm (35mm equivalent: 28mm)
Exposure time: 0.0005 s (1/2000)
Aperture: f/22.0
ISO equiv.: 400
Exposure bias: -0.33
Whitebalance: Auto
Metering Mode: center weight
I myself would be more worried about the noise that you have amongst the trees on your picture, rather than the exposition.
For your question, I personnaly usually check around the picture I want to take by pointing the "centre" at different elements to check disparity in exposure. I use center/weighted metering. I just wave the centre around the frame I want, and then re-frame, adjusting the shutter speed generally.
Hope that helps. I'm sure you will get more useful advice, but that was just my ".02$"