In response to some great user suggestions, the following two features have been added.

1. The audio player in the Complete and Podcast review pages now features a pop-up version, hopefully allowing better coordination between pausing and restarting the audio, while scrolling down the page.

2. There is now a direct access window on the sidebar that lets you go directly to the Vocabulary or Complete page for any lesson. This will hopefully be easier than manually looking for the lesson in the (many) Course Outline pages.

These are great, because I wouldn't have been able to come up with these ideas on my own. If you think of other such features that will help out your overall usability experience do tell!