Most of my blogger feeds and feed burner feeds are indexed in google, and they help a great deal. Anyway, check this RSS SEO article: http://www.rss-specifications.com/rss-seo.htm
If you have a blog, RSS feeds are usually enabled by default, as they should be - most of your readers will probably access your blog via an RSS reader and your RSS subscription. But this makes me wonder about the value, if any, of enabling forum RSS feeds,as DigitalPoint does. Who subscribes to forum RSS feeds and why?
I use rss to pull content from one site to another. I like that places like DP have the feeds - if for nothing other than live bookmarks.