Everyone knows that WPFW 89.3 is a great DC radio station, which has been providing an alternative to mainstream media since 1977. They also speak for DC! Give them a call and donate right now: 202-588-9739 or 1-800-222-9739. Of course, you can also donate online, but thanking the radio station with your own voice is a great thing.
P.S. Also, check out WPFW's fabulous new webpage.