Sources

Another site to background nonprofits and analysis data is GuideStar.  GuideStar is specifically geared towards nonprofits; this is a great watchdog site, one can background a charity before they contribute to it.  There are also interesting lists on GuideStar, like the most searched nonprofits in the last month. GuideStar also encourages nonprofits to update their forms and reports in order to get the 'GuideStar Exchange Seal' on their reports, which helps their credibility.  When looking at 990s and form 1023 it is important to be very speculative..the more questions asked the more credible the nonprofit may be, or possibly more corrupt.
http://www2.guidestar.org/

The U.S. census bureau is also a trusted site when it comes to business statistics and information. There is a specific tab for businesses and nonprofits with multitudes of tables and information.   There is also a breakdown of how much each state contributes each year.  This site is especially useful for comparing data sets of information.

http://factfinder.census.gov/home/saff/main.html?_lang=en

Sources

If we look at charaties and nonprofits as businesses, which they are, a great website to get background financial information is the Securities Exchange Commission.  The SEC requires companies to file certain documents that are readily available to the public.  If you are researching a non-profit, a company's 990 is especially important to look into that way you can compare the administrative costs and the amount that actually goes into the charitable fund.  The SEC website is a great jumping off point when profiling businesses.
http://www.sec.gov/

Another way to start profiling a business would be to search it on the Department of State website.  This is Pennsylvania's business search..
https://www.corporations.state.pa.us/corp/soskb/csearch.asp

Sources

http://www.charitywater.org/

Charity Water uses %100 percent of the donations it recieves to give clean drinking water to poor undeveloped nations.  According to Charity Water, 1 in 6 people do not have clean and safe water to drink.

http://www.freerice.com/

This website is full different games and quizzes to test one's knowledge, what does that have to do with charities you ask?  Well, for each correct answer, Free Rice donates 10 grains of rice through the UN World Food Program.  The rice keeps adding up in a bowl next to your quiz, so when you are bored through out the day you can gain knowledge and simultaneously feed someone in need.