StumbleUpon allows users to discover new content and share them among their followers, it is one of the biggest sources of traffic for many websites.
Previously, users could add StumbleUpon sharing badges to their site, however, none of them were officially supported by SU. However, StumbleUpon has now officially release StumbleUpon badges, which users can easily add to their websites.
The badges are available in different sizes and also display the number of hits a webpage got through StumbleUpon, along with providing users with an option to submit the webpage to SU. The badges are available for WordPress, TypePad, Movable Type, Feedburner, Blogger and any other website.
So, if you are looking to gain more traffic to your website, head over to the Official StumbleUpon Badges page to get the badge of your choice. More info is available at the Official StumbleUpon blog.
Update: There is a bug right now in the badge generation code, no matter which badge you select it will always display the first option. I have notified StumbleUpon about the issue, an update should be available shortly.
Update 2: The badge generation bug has now been fixed.