A lot of these pictures I put very much in the category of "WOOOO!!!! I GOT A NEW CAMERA!!! CLICK CLICK CLICK CLICK!!!" This is totally cool and totally understandble. You should see the first 400 shots that came off my D300.
So now that you've gotten over the initial excitement, its time to focus more intensely on the technical and compositional aspects of the beast. Watch your exposure, framing, be sure to monitor color balance (make sure to color correct your monitor), etc.