For those of you following developments about the evidence in the helmets field you might be interersted in this. http://www.acrs.org.au/srcfiles/ACRSVol21-3-WebLR.pdf
It's a theme edition of the Journal of the Australasian College of Road Safety. It contains Chris Rissel's paper which caused a stir in pointing out the reduction in head injuries observed in Australia around the time of their helmet law could not have been caused by increased cycle helmet wearing.
It provides another nail in the coffin of the case-control studies that show huge benefits for helmets, but have subsequently been exposed as containing poor methodology and systematic bias.
Rissel et al
Re: Rissel et al
Great resource. Thanks for the link.