Every once in awhile you see one API provider making use of APIs from another. This is the case with the eBay Developers Program, who have announced the new eBay API Release Calendar. The calendar is itself a mashup, having been developed using the Google Calendar API. The resulting app is simple but works well: it's color-coded to distinguish the significance of dates that correspond to each event.
Looking for a reason to celebrate? Well, the average person may not be aware of it, but apparently there is a whole list of trivial (and some significant) reasons why anyone could justify celebrating any given day. Anniversarator is a fun, online calculator that provides users with information on special occasions related to the date the put into the search box. The Anniversarator API makes this data available to be integrated with third party applications.