The place to go to see late-breaking news regarding Washington, DC and Baltimore television and radio. They have a great mailbag that I frequently post to, under the name "DLP In Woodbridge".
The best place on the internet to discuss radio. Radio-Info has message boards covering the whole USA, including special message boards for Aircheck collecting and Satellite Radio. I frequently post here under the name "DLP".
Airchecks R Us
A great Airchecks yahoo group. I frequently post here under the name "DLP71085".