I'd like to correct what I believe is a glaring omission in this list : the numerous and hyperactive Brazilian community (first and foremost at INdT of course, but not only there)...
These guys 'n gals have brought us the hildonized Python environment for the tablets (an essential part of the Maemo platform IMHO), many of the first games available for the 770, minimo and lots of other good stuff.
To this day they continue both to make development on the tablets more accessible (with Eagle, Easy etc.) and to innovate, pushing the platform forward with Canola2 and its development tools. Go team ! :-)