Add Drama By Cropping
Just a quick tip: you can add a lot of drama to your photos by cropping them to an extreme vertical or horizontal. Just compare these two versions of the same shot and you'll see what I mean:
The best way to do this, however, is to plan the crop before you even click the shutter. That way, the cropping will be easier, and you'll be able to plan out your drama even better. I know I'm in favor of cropping in-camera (i.e. framing the photo perfectly before you click) but often this is the best way to take a shot.
Another quick tip to remember is that vertical pictures are more dramatic than horizontal pictures, so for a real big boost in drama you can try an extreme vertical crop, like here:
A good place to see this in action is the Bookmark Crop group on Flickr, which right now has only 150 photos but is still an excellent source to see what I'm talking about here.