I also did the survey and what I would like to see is a feature to mark lessons / tutorials as completed. Maybe even show it somewhere in my individual profile, the things I have already mastered (or think I have mastered :P ). That would not only help me keep track of what I have already done and still need to do, but it's also a nice incentive I think, getting all the checkboxes green ... Hey most guitarists are collectors anyway (Gear Acquisition Syndrome anyone?) :)
just my 2 cent
greets!