After a solid afternoon of hacking, the AddThis module has been committed to the Subversion repository. This module integrates the AddThis Widget for social media sharing buttons (from AddThis.com) into a block. A module's control panel interface allows for enabling and disableing the Facebook Like and Google+ 1+ buttons, as well as the 'sharing bar'.

The commit details can be found here. I encourage you to check out the latest revision, install the module, and send me feedback in IRC!

-Jeremy