Recently, this topic has been getting a lot of feedback in the commuting forum:
http://www.bikeforums.net/showthread...ighlight=ulnar
http://www.bikeforums.net/showthread...ighlight=ulnar
Unfortunately, I don't have any encouraging words. My tingling/numbness started half a year ago after an 800 mile tour and I still have the problem (I also commute by bike). I think the only real solution for me would be to get aero (or maybe albatross or North Road) bars.