The Editorial Freelancers Association is announcing a new slate of publishing-related courses to be offered online in the next quarter. You can see the full list here on Katharine O'Moore-Klopf's EditorMom blog. The courses last from 4 to 6 weeks each, and some of them even have (gasp!)homework. If you're an EFA member, you can get a discount on the enrollment fee.
For more information, keep an eye on this page. The courses aren't yet posted there, but will be soon.