Social Subscribers Counter is a plugin which display your twitter followers, facebook fans, and feedburner subscribers with a widget and also in the &
This widget works great for counting Facebook page likes. The Twitter followers code needs a little tweaking to work correctly (see the support forum for a work around.
If the added code for Twitter from the support forum were added and if Feedburner would be removed from this plugin/widget this would easily be five star review.
Either way, it is still the best looking openly available subscriber widget on wordpress.org.