I just did an outdoor portrait session with my new Ray Flash, pictured here attached to my Canon 580EX II. Check out the soft and even light from this ringlite-like rig. Say that three times fast!
Basically, the device captures the light from your on-camera flash and sends it down a chute to a reflector that encircles your lens. Man o man, I should have thought of that! What a cool invention.
Anyway, if you are looking for ringlight-like lighting, and don't have the bucks to spend on a true ringlight (which costs big bucks) for portraiture, check out the Ray Flash. Note that there are difference models for different cameras.
Read all about it on the expoimaging web site.
For some tips on daylight fill flash, see this article I wrote for Outdoor Photographer magazine.
Explore the Light,
P.S. Yes, I warmed up the picture of the girl in Photoshop, using a Color Balance Adjustment Layer.