Seems an improvement. One thing that remains confusing is that mousing over a course that I think is completed displays "Resume Course".

Also, the actual classes themselves need an overhaul. There's something really confusing about trying to proceed through the lessons. The bolded instructions are invariably below-the-fold. It's not always apparent that the "next exercise" link is new (since it displays in the exact same location as the previous link).

Also, some of the courses have exercises that bear no resemblance to anything you'd actually do in reality. I'm pretty sure people learn better when they feel what they are learning is applicable. Even more so than when I'm sure the lesson creator offers something they feel is fun or funny.