Yahoo! Answers today launched four Answers APIs. You can search for questions about anything, narrow your search down by category or user, and see full details of any question, including all the answers.
In addition to XML and serialized PHP, the Answers APIs supply results in JSON format, so you can write proxy-free Web applications. Much more is online at the Developer Network, including our first API Explorer, so you can try things out right there on the site without writing a line of code.