Made some great course slides, now what? I just spent a year preparing a set of course slides for an introductory course in engineering, and they now look really good.  In addition to posting them on my web page, what more can I do to get use out of them?

For example, it would be nice to see if there's a MOOC that would be interested in them, but it doesn't seem like any of the major ones ever solicit such things.

I'm not aware of any examples of "publishing" slides either, so I'd be curious what more experienced users here have done.
Here are some ideas:

Make a video of yourself presenting the slides (either to a class, or just to the camera), and upload it to YouTube (or similar). Others have done this, and as a result there are some great free resources available for people who otherwise would not have the time or money to take the course. For example, N J Wildberger has several maths courses online. If you don't want to be on the video, you can just have the slides, with your voice presenting them. (See the videos of Bill Shillito, for example.)

Put the materials on your website, and spread the news.

Turn the materials into a wikibook, where others can add to them.

Put the materials on OER Commons, Curriki, MyOER, or Share My Lesson. I haven't used any of these myself (yet), so I don't know which would be most appropriate for university-level or postgraduate teaching materials.