Despite recently complaining about public transit in Chicago, I have to say I like ctabustracker.com, the Chicago Transit Authority's online bus tracker. It's a public-private venture with Google, and I think everyone benefits.
In fact, I'm writing this blog entry because I have 11 minutes before my bus comes, and it only takes me 4 minutes to shut down my laptop and get to the bus stop. This, I think, is the epitome of efficient labor markets.
All right, maybe not the epitome, but certainly a good example of them.