Yes, but the one I saw when I didn't need one had 4 icons in it. One Twit, One FB, one email sub, one rss.
I found something that will work for Facebook using CSS/Divs
<div style="position:fixed; bottom:10px; right:10px;"><a href="http://www.facebook.com/pages/eBiz-ROI-Inc/371572207866" target="_blank"><img title="Join our Facebook Fan Page!" alt="Follow us on Twitter" src="to image used in floating dive" border="0" /></a></div> Where it says facebook.com/pages/eBiz-ROI-Inc/371572207866 just change that link to your own facebook fan page link, then place that code anywhere on your page.
Additional details/example can be found http://green.cx/guides/add-a-floatin...t-to-any-site/
Floating button might look great on your site but sometimes you will get some error if you use different browsers and I don't know why.