http://www.charitychoices.com/cfcgive.asp
The CFC’s overhead is low, thus nearly all your money goes to the charities. Many people have an image of the CFC as a huge operation, but it is not. Nationally, fewer than 10 people administer the CFC. Most of the work is done by individual federal employees who agree to act as CFC key workers during their work day. The cost to run the DC-area CFC is about 7%. In contrast, direct mail or telephone solicitation can cost 50-100 percent.
Having your gift deducted from your paycheck is a great, nearly painless way to provide a real boost to the charities you choose to support. Having just $10 deducted from your pay every two weeks adds up to a donation of $260 over the year. Plus, because more than a million people give through the CFC each year, your gift adds up. The average CFC charity gets a big boost from the money they receive through the CFC each year.
I donate to organizations I would support outside of CFC-- ACLU, Planned Parenthood, Bread for the City...