So it's been hinted here that some of her arguments are maybe a little "lightweight"... but I've got to say her 4th chapter "Superhighway to health" presents a great way to sell bicycle infrastructure.
Basically, if you look at the roughly $1 million a mile cost of separated bike lanes, you might consider them an excessive frill that most countries can't really afford.
But, says Blue, if you look at the costs from a wider viewpoint, a couple of facts make them seem a great deal.
1. Any infrastructure that supports active transportation provides enormous cost savings in the health sector.
2. Bicycle infrastructure reduces wear and tear on streets. Basically, if you are riding a bicycle instead of driving a car... you aren't out compacting the roadbed with your 2-ton car.
I know these arguments have been expressed before (here even...) but a nice summary nonetheless.