Here's a bunch of classic TV logos - VIDEO
If you're a TV fan and have been around for a while, the TV logos/credit montage in the video after the jump is going to be like a trip back in time, a history of television in 5 minutes and 33 seconds.
Some of them are national logos (Paramount, Sid and Marty Krofft, Viacom, Desilu), and some of them will probably only be known to people in certain markets (Lexington Broadcast Services?). Some of the companies are repeated, but you get to see different logos they used.
My favorites include the logo that announced the next show on CBS would be a special, the word spiraling and coming towards the viewer, and the classic Stephen J. Cannell ending, with the writer/producer at his typewriter and throwing the paper in the air. I used to practice that in my room.