To add to that, charitybuzz is a for-profit corporation. Not that I am against that, but it is worth keeping in mind as there have been a number of scandals in the past, where money from charitable non-profits gets re-directed to 'non-profit services firms' that are for-profit entities (The Wycleaf Jean scandal is a good example).

In general it is good to keep your eyes open when dealing with the non-profit world. There are some very good, well meaning organizations out there, but there also a lot of organizations that solely exist as tax shelters, influence peddlers, and resume/ego boosters.