Some folks may already be aware of this but I've been asked it a number of times lately so I wanted to put it up for the masses.

When accessing a list's RSS feed, the columns that are displayed in the feed are actually set in a different location than the view that you're working with.  From the settings of the list, look for the RSS Settings item under the Comunications section.  Clicking this will take you to the Modify RSS Settings page where you can select the columns to display in the feed.  Select the ones you want, and then *bam* they appear in your feeds.

Just a quick hit, relatively simple, but I had a few people ask me the same question on this recently.

Enjoy! - M