In the learning center you can mark a lesson as completed, but the next time you visit the site you still have to search for the next lesson by number and name. It would be nice, since the "mark as completed" feature is already there, I could be taken straight or with one click to the next lesson in line.
Another feature request, which I also posted on the blog just now, is that it would be nice if the checklist and schedule were integrated features in the learning center, so that you don't have to make printouts.