Yahoo! has put out an excellent guide to using RSS feeds successfully.
This Publisher’s Guide will show you how to easily distribute your content on Yahoo!
Since Yahoo users can read RSS feeds on their My Yahoo page, adding your feed is a simple way to make it available and accessible on Yahoo!.
The guide shows you how to submit your RSS URL to Yahoo! and how to make your RSS feed more successful.
Best of all they’re tracking your traffic. Every time a user accesses your feed, Yahoo! records this data. Although not representative of all readers on the Internet, it can give you a sampling of your audience.