I sincerely hope they don't do a course on Website performance or page asset loading. Turn on Firebug and refresh the site, and you'll see no script/css combining, lots of un-minified js, and a total download of more than half a megabyte on the homepage. It feels slow too.
No they teach rails development. Lots of rails development is about getting something out the door. Lots of people throw money at a situation instead of more programming effort these days, as its cheaper and "works" as well in the long run for many cases.
This is especially true of apps based on stuff like Heroku.
The initial jQuery course is very introductory, but the plan is to continue ramping up that path in 2-3 further courses. I'd also like to do courses in JS techs like Backbone, Mustache, etc.
Each one of these courses takes man-months of labor input between design, prepping content, refining it, shooting video, editing, building the backend interpreter, writing exercises, and implementing the exercises.
Trust me -- I wish they could be knocked out in a few days!