My New Zealand colleagues Julie Ann Genter and Stuart Donovan have built a great practice doing research on transport and land use policy issues for national and local government. They are both especially strong on parking policy. They've put together a little video explaining the problems with hidden parking subsidies in an urban context, also featuring Auckland University's Tim Hazeldine.
The video is based on Donald Shoup's definitive book, The High Cost of Free Parking. It obviously talks mostly about Auckland, but the issues it presents are the same in almost any New World city.
Julie Ann Genter also has a paper on the topic here.
Thanks to Joshua Arbury of the Auckland Transport Blog for reminding me about this.