Adds MediaRSS to your RSS2 feeds. The first image in a post will be the post's thumbnail on services that support it (e.g. FriendFeed)
MediaRSS is a way of embedding media into your feeds. The specification at http://search.yahoo.com/mrss/ provides for many kinds of media: audio, video, etc. This plugin is equipped to locate img tags in your posts and generate XML code that can be used by feed readers.
Also included are code samples demonstrating how to extend the plugin's functionality to meet your needs. Some PHP experience is assumed.