He is a rather curious looking wasp - I am used to wasps having wide strips of alternating black and yellow, but on him the yellow strips act more as accents. Just a fine edge on each of the sections of his abdomen, and a little bit of eyeliner, and some racing strips on the thorax.
Most of my google search results for a while were for wasp exterminators, so it took me a while to figure out what he might be. It looks like a potter wasp is one possibility.
http://www.cirrusimage.com/bees_wasps_potter.htm
(I think he looks more like the title picture of the Eastern Yellowjacket (2nd picture), but not like the contents the link of the picture leads to http://www.cirrusimage.com/hymenoptera.htm )