Just found a whole sleuth of nutrition and hunger-related organizations both for NYC and worldwide. Here are some links:
www.foodsystemsnyc.org, especially http://www.foodsystemsnyc.org/members
One of the links on this page brought me to www.worldhungeryear.org - and a particularly good blog, http://www.worldhungeryear.org/reporter/index.asp
I just scratched the surface looking up these websites; I have much more to learn.
Here's a good list from the s'Cool Food organization out in Santa Barbara, CA: http://scoolfood.org/resources/resources.cfm?section=resources
And while I'm at it, go to http://www.helpuu.com/ and http://www.ripple.org/ and set one (or both) of them as your web broswer - it's a simple way to make a difference.