WordPress blogs come with feeds for posts, comments and even for individual categories. But it is always a good idea to use FeedBurner feeds for your posts as it gives you a host of excellent features for free(like feed count and e-mail subscriptions for your feed). So if you want to replace your default WordPress feed with FeedBurner feeds, the first and only thing you need to do is use the FeedBurner FeedSmith plugin for WordPress.
What FeedBurner FeedSmith plugin does ?
The FeedBurner FeedSmith plugin will detect all ways to access your feed (e.g. http://www.yoursite.com/feed/ or http://www.yoursite.com/wp-rss2.php, etc.), and redirect them to your FeedBurner feed so you can track every possible subscriber. It will forward for your main posts feed, and optionally your main comments feed as well.
This plugin was earlier being developed by Steve of OrderedList. Now Feedburner has acquired this plugin and renamed it FeedBurner FeedSmith.
If you are currently using the original “FeedBurner plugin” from Ordered List, then you do not need to upgrade as the version is same. But all future upgrades will now be available from Feedburner directly.
FeedBurner FeedSmith Plugin – Download & Installation Instructions