The prerelease version of Automator currently comes with 123 Actions that are grouped into categories according to function. The categories include Mail, Find, Alert, People, and iPod, and users can search for Actions using Tiger’s standard Mac OS X search field. The alternate view command groups the Actions by keyword, which can be a quick way to narrow down the choice when searching for a particular Action. The set of Actions offered to developers is not restricted to Apple’s own applications: currently it includes Actions included for Microsoft Corp.’s PowerPoint presentation software.
So the taxonomy is not organized for the user based on application but rather on typical work tasks (for home users, that is–Apple’s primary audience). As it should be.