If I were you - I might switch all the free content to be at the top of the page. Initially when I clicked the link I immediately saw "sign up to access" on 6/7 of courses. Luckily I know how to use the scroll bar :) Just saying I fly though most of these links and sometimes don't even stop to scroll. HN is an awesome market for your team - it might even deserve it's own offer splash page or something.. ? Keep up the good work.