This small article might help you to figure out quickly how to work with the AddThis module for Drupal.
It is not a substitute to the original documentation : it just provides a concrete view of the configuration process from my experience.
Here is a sample "toolbox" generated with the AddThis module :
Here is an overview of the main steps to get AddThis working on Drupal :
- install the module : http://drupal.org/project/addthis
- choose in which nodes it appears : page, story, teasers, ...
- select which type of widget you want : they are called "button" and "toolbox" in the configure tab
- build the widget by adding components to it (only for "toolbox") : components includes popular buttons like facebook like, google +1, tweet, but also custom elements like separator, addthis 'more' button
- add a service customization for each component you listed : this step simply provides each component with adequate parameters
- customize it more using the numerous other options
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