 Advertise your material

whenever you walk into a classroom, give students a link to the material

Then ask them if they want to talk about anything.

Then leave the classroom and go produce more good material instead of wasting your time there :-)

whenever someone asks as question on an online forum, answer it, and link to the section of your material that also answers that question.

The material will answer many of their future questions.

after you've done something awesome, Google possible relevant keywords that should hit it.

This will lead you to other websites that talk about the same content.

Then, leave comments on those pages linking to your stuff, or email the authors of those pages.

It is borderline spam, but if the subject is closely related, it is a win for everyone.