Mutual aid itself is probably inherently crowdsourced?
This is a mapping project – Hurricane Irene Clean Up Efforts – with the tagline “ordinary people help ordinary people.”
As the site says “disaster responders can’t be everywhere at the same time.”
People can report their projects, or projects they know about, categorize them, map them and generally get the word out. Need can also be reported. Reports can be categorized as: Clean up efforts; Damage; Information Sources; Media Outlets; Severe Weather; Supplies Needed; Transportation; Water & Sanitation