greatnonprofits.org was recommended by a magazine if you want to check out a charity before you donate to them. I was pretty underwhelmed by this site.

Once you put in the name of your charity/non-profit there is some basic info provided. The majority of the infor is comments via bulletin board posts made by anyone. You are asked to say if you are a volunteer, board member, chair person, etc. Well sorry, I can say anything I want about a charity but that doesn't make it true.

I recommend givewell.org instead as it provides facts and sources for its info.