[nerdponx]

Our catalog currently consists of all courses from Coursera, edX, Udacity, Udemy, and The Great Courses

Just put that sentence on your site.

It would also be helpful to see "class sizes" for a given course. I don't want to sign up only to find after the fact that nobody is taking the same course as me.

[johnnyodonnell]

I like that copy as well.

Having class sizes is a great idea. I'll have to look into adding that.