I like touring handlebars for longer, out-of-town rides but I feel they make the bike less nimble so for city riding I still prefer flat bars. Also, in the city I like to have my fingers on the brakes most of the time so I won't be able to use all the other hand positions much. But if your commute is in rural or otherwise quiet area you can definitely give them a shot. You can get gel pads from Nashbar and apply them before wrapping the bars with nice cork tape, they'll be very comfy. Also, besides offering multiple hand positions, a touring bar like the one irclean has flexes a bit, the part that is away from the stem, so that naturally acts as spring damping road vibrations too.

The Ergon grips made huge difference though for me in comfort just with the flat bar. My commuter feels almost like my steel touring bike.