BurnFeed Email Subscription plugin allows you to show Google Feedburner subscription form either as a floating button or in sidebar of your website.

A customizable widget allowing you to place a Feedburner email subscribe form in any widgetized area of your site.

Free Feedburner Alternative and RSS Redirect plugin from follow.it.

Just use Feedburner Email Subscriber service on your website sitebar widget..

Allows you to display your Feedburner subscriber count in a widget or in your posts without having to use Feedburner's not so beautiful icon :)

Feedburner Follow Me plugin allows you to show Google Feedburner subscription form either as a floating button or in sidebar of your website.

Feedburner Text Counter is show your Feedburner Subscribers Count like text based.