This is the description from Widgipedia:
Replace that old RSS button for this cool Flash button to promote your feed and allow your viewers to subscribe to your site with ease. Just put this widget into your blog (or any other page with a feed) and flash will do the rest.
The original design was made by UtomBox and you can find it here, and this is the way it looks:
Subscribe to my feed
Click on the "get" button to grab it and embed it into your blog and of course, click on the widget itself to add my feed to your reader ;)