This document discusses Yahoo!'s open platform strategy and opportunities for developers. It highlights Yahoo's large audience of 330M users on the home page and 300M users of Yahoo Mail. It describes two ways for developers to build an audience on Yahoo!: through home page applications and syndicating user-generated content to Yahoo! Updates. The document outlines the Yahoo! Application Platform (YAP) for building standards-based applications accessible from the Yahoo! home page. It also discusses Yahoo!'s social APIs and services like Yahoo! Updates that allow syndication of content and referral traffic between sites.