Related posts in RSS feeds are an oft-requested YARPP feature, and I'm happy to report that it is coming in version 2.1!
However, as there are a lot of different RSS set ups that people have, I'd really appreciate it if any of you could test this version.
Download the YARPP version 2.1 beta
(Note, the version number in the files still says 2.0.6... just replace your
yet-another-related-posts-plugin folder with this one. You can always go back to 2.0.6 if need be.)
Please leave your feedback in this forum, or email me. Thanks!