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.

shabbirbhimani

Footer Slideup Form is one of the best ways to ask your user to subscribe to your list without any interruption or blocking and this plugin does exactly that. It adds an FeedBurner subscribe sliding form in the footer of your WordPress blog.
I use and recommend <a HREF="http://imtips.co/feedburner-vs-aweber.html" rel="nofollow ugc">AWeber over Feedburner</a> for RSS to email but my blog readers wanted to have Slideup plugin for Feedburner like I have for AWeber.

FeedBurner Footer SlideUp

Footer Slideup Form adds Feedburner Email Subscription form into the footer where user's can subscribe to your RSS feed using email.

Hetjens Feed Redirect vs FeedBurner Footer SlideUp