Some quick facts:
-Michigan has the second highest per-unit labor costs in the nation
-Between 1970 and 2000 non-right-to-work states lost 2.3 million manufacturing jobs
-right-to-work states over the same period gained 1.4 million manufacturing jobs.
-Wages in rtw states are lower, but that is w/o cost of living adjustments
-2001 David Kendrick of the National Institute for Labor Relations Research did similar calculations for nine Midwestern states and found that take-home pay was higher under right-to-work laws.
Quickly cherrypicked (i'm doing hw) from:
http://www.mackinac.org/article.aspx?ID=5937
Which is a conservative group obv, but its in line with stats I've seen prior