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You cannot legally watch cable televison online. You can watch individual shows at hulu and network websites.
hulu
tv blinx and tv duck have links to watch the shows online
As of June 2010, you cannot legally watch it online.
Youtube does have TV shows online to watch, but not all of those videos are there legally. For legal TV online, try out Hulu. Hulu has a lot of shows and movies for free, and their Hulu Plus subscription is really cheap.
Legally you cannot watch it online.
Any television equipped with an antenna can allow one to watch free television shoes legally in the US. Also, many of the major broadcast networks allow viewers to watch selected episodes of shows online from their websites.
The NFL says no you can't legally watch it online without paying them.
You could watch TV shows online directly on the network website. You could also watch them on Hulu or Hulu Plus. Of course, there are other that are not legal because they have do not have the copyright.
You can "legally" watch them on 1channel.ch
As of August 2010, you cannot legally watch it online.
hulu.com, cbs.com, nbc.com, abc.com, fox.com