I picked up just a few for work including..

Nonprofit .mobi - news, tools, and job listings for the sector in which I work.
Donor .mobi and Giving .mobi - for giving to charity through a mobile device.

and for no particular reason...
PropertyListings .mobi - a little long but envisioned driving or walking by a property for sale and being able to view mls property details or listen to a description of the property.

Most terms associated with my work are listed as premium domains so I was surprised "nonprofit" was available to register. If the extension catches on, great; if not, no great loss.