johnlawrence

PopuList allows you to track the popularity of your posts on social bookmarking sites reddit, stumbleupon, del.icio.us and digg. When PopuList is activated, a page is added to your dashboard giving the number of times a page has been saved or upvoted.
New in version 1.5 PopuList now also lets you view backlinks as indexed by Google and Yahoo.

Populist

Track the popularity of your posts on social bookmarking sites reddit, stumbleupon, del.icio.us and digg

Nolongeractive

To use the widget just drag it to a sidebar and choose one of six button styles. You can also specify a url to recommend. If you leave the url empty, the active page will be recommended.

Stumble Page Social Widget

This plugin lets you place a StumbleUpon button on your WordPress blog as a widget. You can configure the button by choosing the style and specifying  …

Populist vs Stumble Page Social Widget