The site’s geared towards engineers (and written just as poorly), but USDOT’s new “BikeSafe site”:http://www.bicyclinginfo.org/bikesafe/index.cfm features pretty comprehensive lists of “engineering, education, and enforcement countermeasures”:http://www.bicyclinginfo.org/bikesafe/treatments.cfm (with “case studies”:http://www.bicyclinginfo.org/bikesafe/case_studies.cfm) and, well, “ways bike crashes happen”:http://www.bicyclinginfo.org/bikesafe/crash_factors.cfm.