I'vRead is a service for keeping track of what books you've read. Seems simple, but it can be rather useful for those of us obsessed with reading like myself. Its web site offers the service for free, and using it is already pretty simple. There isn't even another account to register for. All a user needs to do is add a specific tag, @ivread, to a Twitter post mentioning the book. It allows for some basic searches of the data on their website, but the I'vRead API is where the service really shines.
Riders on New York City subways are subject to all sorts of sights. For several months, that has included prominent advertisements for the MTA API, the developer program of New York City's transit company. The ad (pictured below) includes the headline, "Our apps are whiz kid certified."