Ask HN: How to market a video course?

Hi all, I'm working on a video course for advanced ios development, inspired by http://scotthurff.com/qc/, was wondering if anyone could give me ideas for marketing it when the time comes to launch eventually?

I've got a blog with a mailchimp list of ~400 members and possibly ~200 RSS subscribers, but other than that i'd love to hear suggestions for how to reach people.

Thanks so much.