I have been doing some experimenting with back lighting lately. For macro shots it is easier to control the exposure without a lot of blown out areas.
I am still experimenting with non-macro images, and I tend to have a hard time calculating the correct exposure. Bracketing once again gives me a choice, and I find myself favoring the darker images as there is more detail in the under exposed areas.
The only worry is the digital noise that tends to creep into the darker images. This was a big concern with my point and shoot camera, and the worry has carried over into my DSLR shooting.
From reading several sources, the advice given is to "shoot to the right", which means to have the picture a bit more over exposed than underexposed.
I will continue to experiment with the back lighting as it can give some dramatic effects when it all works together. Perhaps that's the secret, look at what's there instead of trying to make something there.