A new study was released by the University of Pittsburgh and published in the American Journal of Public Health concerning injuries and the repeal of Pennsylvania's helmet law.
The study has some interesting quantitative data concerning helmet use, injuries (both head and non-head), and motality.
The article is available for reprint for a small fee, however, since WebBikeWorld.com has provided an excellent summary of the report, I opted not to download the article. You can read their summary here.
Without stepping into it too deep, I'll just relay some wisdom from Conchscooter when he wrote "... if you hit the ground with your noggin you stand a better chance of suffering less injury with a lid on."