Basically, I'd like to see a "my feed" option that allows you to filter out completed lessons. As I have completed them, downloading the tracks again likely would not do me any good. It also would save on a lot of clutter in both the feed listing and figuring out what is what on my hard drive.
I'm not sure how hard this would be for your developers to do, but it seems like a very useful feature. It would also save both sides bandwidth.
Thanks,
Kevin