I am not sure if this is vignetting or bokeh, either way it is a really cool photographic technique. The website has a really nice example of the effect. Learn more about, or just join the debate about, creating your own Bokeh.
I’m currently working full time as the Dexter F. Baker Professor of Practice in Creativity in the Masters of Engineering in Technical Entrepreneurship Program at Lehigh University. I’m also an avid product designer, kit maker, author, father, tinkerer, and member of the MAKE Technical Advisory board.