The latest project from Comptroller John Liu's office, and it looks like a good idea to me:

Comptroller John Liu's www.checkbooknyc.com offers unprecedented access into how the City of New York spends its nearly $70 billion annual budget.

While it's catapulted the Big Apple to top in the nation in governmental financial transparency, that was never the end goal. The real goal is to simply compel more judicious spending of precious taxdollars.

The idea here is that opening up government's books and baring it all online empowers and enlists the public to keep an eye out. Then, when city agencies know that every penny spent is being watched, there is an inherent incentive to exercise that much more care in the spending of the public's dime.

The website breaks down city spending by department, vendor, contract, etc. See where your money is being spent by the city!