Yahoo APIs and developer network

Yahoo! Search Web Services allow you to access Yahoo content and services in your favorite programming languages. This means you can now build Yahoo directly into your own applications.

developer.yahoo.net

via Slashdot Yahoo Debuts Search APIs /.

O'Reilly has a tutorial already: Yahoo Web Services.

Yahoo's Web Services use the familiar REST architecture, where specially constructed URLs return an XML response in a unique format. In addition to web search results, Yahoo's API includes the ability to fetch results for images, local information, news, and video.

There is also a Yahoo Developer blog and a wiki.

As a side note, I discovered that Yahoo is also offering site search now.