They now have just announced the availability of free simple vocabulary reinforcement widgets anybody can get (without registration) for their blog or website.
I can’t seem to get their embed code to work on my blog, however. I’ll check with Edublogs to see what I’m doing wrong. Let me know if it works for you.
(Busuu now says it has something to do with compatibility with Edublogs’ platform. They are going to see if they can make their widget usable with Edublogs next week)