I saw via Twitter last week (sorry, can’t remember who posted it!) this post about the New York Times Newswire API. In essence, the Times has published an interface with which you can access their latest headlines, including tons of meta data options to slice and dice your query.
This kind of API tends to result in a lot of experimentation and new value in presenting the content available via the system. Twitter’s API is a great example of this.
Pretty innovative stuff. If you are in the business of moving content this is something to check out.