My name is Petri Purho and I've created couple of small games with the previous versions of Box2D. Probably the most recognized of those games is Crayon Physics
I'm really thankful for creating such a great 2D physics engine. Those games I've created would not have seen the light of the day with out Box2D. So I was really excited when I read that you're continuing the development of Box2D. I'd love to help with the development, but I don't know if my understanding of physics is high enough for me to do any constructive work. Maybe the best way for me to contribute would be to create an example game and release the source code for it. Unfortunately I'm "booked" for the next two months, so the earliest I could get this game out would be December. Let me know what you think.