More social interactions like LiveMocha
I think duolingo is really great and can even be much more!
Before I used livemocha.com, because it has nice material and I learned a lot of portuguese there. But now I use duolingo
In any case I miss a couple features that made livemocha a great international social experience than just a simple language learning tool.
- you can chat with any person in the site, make new friends and practice the different languages that you're learning
- people can correct you more complicated exercises (written and spoken) for a more advance learning (and you can correct them too)
I am a developer from Chile and I'd love to help you with those features if you want (like in a branch of your code or whatever)
Keep the good work, you're definitively heading for something great!
update: fix a couple typos :B