The last time my company had some spare capacity I offered to do pro bono work on this list and we ended up building http://habitatmap.org and http://aircasting.org, both of which you've seen presented at the New York Tech Meetups.
Now it looks like we'll have a team free starting sometime next month and I'd like to make the same offer to the NY tech community.
If you're a non-profit and could use a great Ruby on Rails team to help you make the world a better place, please get in touch.
All the best,