America's worst charities: Legit-sounding charities that do little good with the money they collect.

List of the worst offenders: http://www.tampabay.com/americas-worst-charities/ 

Other resources where you can look up charities to see what percentage of funds they actually donate to their causes:

http://www.givewell.org/

http://www.charitynavigator.org/

https://www.charitywatch.org/home

http://www.bbb.org/