Hey, Scott Lembcke here, the author of Chipmunk Physics.
I'm doing a polar bear plunge this weekend to help raise money for charity (the special olympics specifically). I was hoping that my being mildly internet famous could pull in a few donations from happy Chipmunk physics users. Also, it means that you get to see physics programmers jumping in freezing water. (There will be pictures)
Read more on the official Chipmunk Physics forums:
http://www.slembcke.net/forums/viewtopic.php?f=1&t=1375&p=6320#p6320
Hopefully this doesn't break any forum rules about solicitation.