You can find several types of documentation here. For visual docs take a look at the screengrabs and videos, to get down to the nitty gritty details head to the Node descriptions.
Aperture Assistant Documentation
Short definitions of the different terms used in Aperture Assistant.
A series of examples of how to set up workflows, based on specific tasks you might want to do.
A variety of screengrabs showing the interface and several different workflows. Screengrabs showing workflows will usually have a link where you can download the workflow to try it out for yourself.
Videocasts and tutorials. Videos showing workflows will usually have a link where you can download the workflow to try it out for yourself.
Detailed documentation of the different Nodes available for use in your workflows.
Some tasks in Aperture Assistant are done directly without use of Nodes, such as finding duplicate Masters.
