Jigsaw, has announced additions to their RESTful JSON and XML API as well as a developer program designed to enable developers to query, share, and resell Jigsaw’s community-contributed database of company data and contact information. They came onto the API scene in June 2008 with their declaration of "Data Independence Day", which focused on providing free access to their database of company information (more details at our Jigsaw API Profile).
Looking for something cool to do but have no idea where to start? A tool like LairOut could be helpful in this situation. It's basically a web-based event directory that allows users to access information on a number of events happening in and around their location. LairOut also provides the LairOut API that allows developers to access this functionality.
There are many tools to analyze and rank Twitter users, but a new one takes a trick from Google's book. Trst.me uses an algorithm similar to Google's PageRank to give any Twitter user a score from one to 10 based on their followers' networks of followers.