i can see this poll will be dominated by natural light here because more than 95% of the members don't understand how to use flash nor do they have an off camera flash which is a shame.
once you learn how to use it, it will make a huge difference in the quality of your work because of the newly created light.
check out strobist.blogspot.com as well as some reader's photos
http://www.flickr.com/photos/31454864@N00/favorites/