ESPN has a subscription service called 360. Also, MLB has a deal called GameDay where it shows the stats of each game online along with pitch placement and some hightlights. As for feeds from the networks live on the Internets, you might want to try this:
http://wwitv.com/portal.htm
(And yes, I meant to say Internets! It is an inside joke to those that know! You see, it is like a bunch of pipes, and...)
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