Joel Grimes 3 light look

Though this is far from an original technique, Joel Grimes posted a tutorial on how to achieve this look. http://web.me.com/joelgrimes/Joel_Grimes_Photography/Edgy_portraits_3_lights.html

The basics are 2 gridded lights at maybe 2 and 10 o'clock behind the subject overexposing the subject at 2 to 2.5 stops, and then a frontal light underexposing the subject by about 1 stop. This will create a strong rim around the subject.

Here it appears he also underexposed the background by about 2 stops. This could probably be done over an HDR composite as well.