Graph your progress (monthly)
You now have a "weekly progress," which I like to look at as I'm studying for the week. What you now need is to look further than a short week and look at the "monthly progress report." This would be a fine edition to the already many great features of Duolingo. It is an ongoing, long term effort to learn a new language and many people would benefit from this.
As a teacher, I would love to know how my students could share their weekly progress with me, or how I could add my students to a virtual "class" so that I could monitor their progress. Is there a way to do this? It would be great to have this progress visible to all in the "class." (More than just following 3 other users).
I'm not sure you still use the site, but you can access your student's pages directly.
http://duolingo.com/#/MadameSchwartz is your page for example.
Bookmark each of those pages and then you can revisit them quickly.
On the profile page you can see each student's score and then transfer it to a spreadsheet, or whatever tracking system you use.
It's a bit of a chore but if you're only doing it once a week, not so bad.
Hopefully, the site will have your virtual class functionality at some point.
This is exactly what I wanted to suggest, maybe on even bigger scale: how about the overall progress graph? For example, just today I wanted to check for how long have I been studying with Duolingo and compare my progress with friends who go to the language courses.
It is great to see your weekly statistics, but it would be just awesome to see everything!