The Chartbeat Ruby SDK by Al Shaw allows to communicate with the API to integrate charts analytics data into web services. Resources include installation and usage. Code shows real time calls, historical calls, and alternative options.
Microsoft's latest version of its search API (our Live Search API Profile), which was released last November as a public beta, seems to be gaining quite a bit of momentum. According to a recent post on the Live Search Blog, the API is serving more than 3 billion queries per month, more than 5,000 applications to use the API, and queries from third party sites account for 80% of the API's query volume.