S Hetjens

This plug-in redirects requests to the main or comment feeds, and only theses two, to Feedburner or a similar service. In comparision to the original Feedsmith-plug-in is has three advantages:
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It redirects only the two main feeds of the blog and not all. The category, tag and author feeds are still accessible
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If you need access to the original blog feed you can add the URL parameter “noredirect” (i.e. /feed/?noredirect) to your feed address and it will not forward your request.
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The Plugin is more integrated into the administration interface. It adds its settings to the default “reading” settings pages and do not create an own page.
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Hetjens Feed Redirect

This plug-in redirect reqests to the main or comment feed of the blog to Feedburner or a similar service.

Tobias Eisenschmidt

RSS Links Manager lets you easily customise your RSS links via WordPress’ admin menu. Are you using Feedburner? Just enter your Feedburner URL. Are you using Disqus or Facebook comments instead of WordPress’ internal comment system? Just deactivate the feeds you don’t need – including category, tag and author feeds.
Features:
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<li>Customise your feed links (title, URL, MIME type)</li>
<li>Remove individual feed links (main feed, comments, extras)</li>
<li>Directly hooks into WordPress’ wp_head functon</li>
<li>Multilingual (English and German)</li>
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RSS Links Manager

Manage and customise your RSS feed links.

Hetjens Feed Redirect vs RSS Links Manager