Mashery.com is a site or company that is in the business of managing api’s for on-demand infrastructures.
API’s allow users to mashup and use your content in ways that will most often help promote your site and help spread the word.
If you’ve never heard of API’s they stand for Application, Program, Interface, and what basically means it’s a database that programmers can interface or request data sets from. The data is usually in .csv or .txt format.
API’s also allow smart phones like blackberries, google android, and apple iphone to interface with web content on the fly.