I've just released CaRP/WP, a free WordPress plugin that makes it easy to add auto-updating content to your WordPress posts, including keyword-based Amazon.com best sellers affiliate links. Update: It can display YouTube video feeds too. See examples of both below.

The plugin uses CaRP, my RSS to HTML converter script (free and commercial versions available), to display the RSS feeds, so you get all of the configuration options of CaRP, and they're even easier to use since you don't have to write any PHP code.

Full instructions and a download link can be found on the CaRP/WP homepage.

Here are a few example feeds:


[carpwp:youtube-tag{rss feed}][/carpwp]

[CaRP/WP] ERROR: "carp.php" not found at the location indicated. Please check your configuration.