Use this below URL and replace [USERNAME] with your Twitter username to use your Twitter RSS Feed:

http://api.twitter.com/1/statuses/user_timeline.rss?screen_name=[USERNAME] (Where [USERNAME] is your twitter username.)

That’s it, it’s really that simple.
How to Find Your Twitter Favorites RSS Feed

Your feed for only the favorites:

http://twitter.com/favorites/[USERNAME].rss (Where [USERNAME] is your twitter username.)

External web application to read your twitter feed http://www.twittertorss.com/