Yea, I've rocked the flat bars a few times, and they're pretty b*itchin. A lowish stem, 0 deg rise, and shortish flat bars, it is awesome for riding. I like it that you are still in an upright position while riding, but you hands are nice and low. Weaving through traffic with flat bars is the best.
Cut 'em thin. Wide bars suck on the road.
I dunno about risers, the asthetics sort of bother me on a SS/fixed gear bike, but i've never used them....