JA Sensei version 1.7.0 is now available on the Android Market. This time, the lessons have been integrated. It is not (yet) as interactive as the lessons on the site, but it will let you take the lessons with you when you cannot visit Japan-Activator regularly, or when you are in the subway. 

I also took the opportunity to modify the main menu because with all the modules, it was getting hard to find quickly what one was looking for. Visual icons are easier to identify modules right away, and it's simply more enjoyable to use than dull grey buttons.