Joerg Batterman’s blog for startups included a helpful post for redirecting Typo RSS feeds to Feedburner. The advice is here:

Permanent Redirects to FeedBurner through mod_rewrite for your Typo + Apache blog

Its one of those things that you realize how terribly simple it is, and the advice can easily be transferred over to Wordpress. So, you have existing subscribers to your feed? Your host have mod_rewrite? Have an idea what an .htaccess file is? Then read on!

First open a feedburner account. Then go to the root of your blog and open the htaccess file. Scroll down to the bottom of the file where you see the following:

</IfModule>
# END Wordpress

Right beneath that, insert the following:

#forward to feedburner
RewriteRule ^/feed$ http://feeds.feedburner.com/YOURFEED [R=301]
RewriteRule ^/feed/atom$ http://feeds.feedburner.com/YOURFEED [R=301]

And your all set! It may take some time to populate the new feed URL to your existing subscribers RSS readers, but in a few hours you should be done.