Try these, too:
You can download additional animation presets that take advantage of per-character 3D text animation from the After Effects Exchange on the Adobe website.
Trish and Chris Meyer introduce per-character 3D text animation in n a video on the ProVideo Coalition website.
Eran Stern provides a video tutorial on the Creative COW website that demonstrates how to use per-character 3D text animation to animate text along a path in the shape of a 3D tornado.
Angie Taylor provides a tutorial on the Digital Arts website that shows how to use per-character 3D text animation together with a common workaround for simulating extruded 3D text.
Definitely follow the links to full resources, but here's the quick answer:
You add a text animator for Rotation. You use a range selector to specify the range for the animator to affect. You modify the Rotation property within the animator.