Chart APIs are useful and popular, and Google knows how to do them well, so they're continuously adding more features and options for customization to their Visualization API. The Google Code Blog recently highlighted a few of the newest features.
ProgrammableWeb recently reported about the launch of the new YouTube Data API Version 3.0 (experimental) which includes a New Topics API and Universal Search feature powered by Freebase. This post provides an overview of the Freebase API which allows the YouTube Data API to perform search queries using Freebase IDs instead of keywords.
Gliffy, a browser-based diagramming and flowchart tool, today announced the public availability of their new API (technical details at our Gliffy API Profile). The four year old company announced the new API on its blog, noting that Gliffy hopes to take advantage of the growing trend of companies that are unlocking their APIs to extend the reach of their applications and data.