This release adds support for theming, control per content type, removes an extra div around addthis button and updates supported services list at admin. No configuration changes are required, just make sure that all caches are flushed after the update. If you want to disable addthis button for a content type use workflow settings at admin/content/node-type/
CAUTION: If your current theme depends on class addthis you will need to modify your theme or use theme_addthis_button to get the div back!! The div was removed since it caused HTML validation to fail, sorry about the inconvenience.
addthis.css file is no longed needed and it will be removed on next release.