Bing SDK for iPhone & Mac is a Cocoa Framework which enables Mac and iPhone developers to easily integrate Bing search results into their applications.
The Bing SDK for iPhone & Mac was designed to remove the headache of manually having to parse XML or JSON in order to communicate with the Bing API. (Thanks Tom)
The Bing SDK for iPhone & Mac provides:
The ability to easily query Bing from within your Cocoa or Cocoa Touch application. Perform both synchronous and asynchronous queries. Search Bing for Web, Image, Video, News, and Phonebook results.
NOTE: In the download section you can also get a quick "getting started" doc and the full documentation for all the objects and classes in the library.
Click Here for All Free Bing Software & Resources