Me and My Big Mouth

I have just added the following to the PledgeBank:

"I will contribute $500 US to the WorldChanging fund but only if 4 other people (or groups) will too."

One day on, and with ten days to go, I need just 3 more people to join me... any takers?

(Update: the pledge target has been reached, and my hip pocket is feeling the sting!)