This is a subject I played around with in the past, My current camera is indisposed at the moment so I can't take any shots to explain it but this is a good example from myself :) please feel free to post some of your own shots with a secondary lighting source
Suns on the left, diffused reflector on the right
Hey Cheef,
Since you are new'ish it would be good to know about a few forums.
Photo Gallery is like a coffee shop wall. Come as you like and comment on the pretty pictures
Photo Critique & Analysis Forum is where you can get honest feedback about things you might not even have known were wrong
Photo Analysis is where you go with a specific problem, like why do my photos have this weird spot
and of course there are many specialized ones too
They can all be found here
http://www.uglyhedgehog.com/section_list.jsp
If you want to reply, then
register here. Registration is free and your account is created instantly, so you can post right away.