Several days ago I tried to watch some episodes of TV shows on CBS.com from their "TV Classic" section. But every episode from the Twilight Zone, Perry Mason and Hawaii 5-O that I tried to watch stated that this episode is no longer available.

Has anybodoy else tried this site recently and did you get the same message? I wrote to them, but they have yet to respond as to why they would keep the links up to all these shows but not have them available.

Keep watching this (http://www.youtube.com/profile?user=CBS&view=playlists). They started putting their stuff on YouTube a couple of months ago, but as of now, they don't have any of the shows that you listed yet.