From "More or Less" on BBC4: Good info about the safety of cycling beginning at about ten minutes into the broadcast, running for seven minutes.
https://downloads.bbc.co.uk/podcasts/radio4/moreorless/moreorless_20100903-1248a.mp3
There are a lot of good points here about comparing apples with apples. I will also note that the leading cause of death for 1-31year olds is automobile accidents. Additionally the 5-25 year olds make up the bulk of bicycle crashes so if you are outside of that age range bicycling looks more attractive then driving, at least in my opinion. Listen to the broadcast for more points why bicycling may not be as dangerous as we thought (we need more data to say so with any degree of certainty but the clues are there.)
Biking in Baltimore