Insulindependence is an interesting organization. I have signed up but haven't "run into" them since we are on sort of a different schedule here in Chicago as they do the triathlon and I was running the marathon. Someday (maybe next year...), I'd like to run the marathon (1/2?) in Carlsbad and I know they have a big presence there. Of course, if I was really gung-ho, I'd get off my butt and start a chapter but haven't done anything like that for a while. Maybe they'd fit what you are looking for as they are oriented towards supporting activity for people with diabetes.
It also occurred to me that they could support DHF/ Tudiabetes.org as well! The Big Blue Test has grown into a pretty enormous even that would be fun to work into a training routine!