IBM released a study on commuting ... IBM Press room - 2008-05-30 IBM ‚ÄúCommuter Pain‚Ä? Survey Focuses on Fuel Spending Limit, Frustration and Sleep Deprivation - United States which has gotten an article in newspapers in every city they studied.
The executive summary is here
It should be noted that compared to "ground truth" (i.e. other better done surveys) their results are biased toward participants with longer than average commutes. One also has to question the methodology that simply raised the price and asked whether people would change.
Minneapolis-St. Paul had the least pain of the surveyed cities, but it should be noted it is also the smallest metro area of those surveyed.
The local article is here