Local
WMPT--Channel 22 (Maryland Public Television)
The Capitol Connection Fairfax, VA--Providing C-SPAN I & II, CNN, CNBC and the Open Meetings of the FCC, FERC & NTSB to Professionals throughout the Washington DC area.
CTV Channel 76 Landover, MD--Live daily News, studio and field productions, event coverage, etc.
DCTV Washington, DC--Public Access Television
Fairfax Public Access, Channel 10 Fairfax, VA--Produce your own radio or television program and air it via Channel 10 or WEBR Radio on Cox Cable to over 900,000 residents of Fairfax County.
NEWSCHANNEL 8
WETA--Channel 26 (PBS)
WJLA-TV Channel 7 (ABC)
WRC--Channel 4 (NBC)
WUSA--Channel 9 (CBS)
WUPN--Channel 20's Free E-mail Service
WNVC--Channel 56

Networks
CBS
CNN
Community TV USA Network Washington, DC--Community TV events
C-SPAN
Fox
NBC
NPR
PBS

Guides
Searchable TV listings (from the Washington Post)