It's not illegal to watch it over the internet, and some cable companies host their own broadband so they're getting the difference from the broadband bills. that is, you pay $30 per month (example) they get their money either way. otherwise it's just like
OTA TV. i don't think Cable companies have problems with people viewing digital tv for free either.
I think that Kris thought you meant planning on 'stealing' cable. that's illegal.
There's a few sites with a whole playlist of various shows. my two favs are:
SurfTheChannel - Home
TV Shack - tune in
There's movies, too. have fun! and watch out for Youku links, they're the slowest at buffering rates so if you don't want your shows to keep cutting out try to avoid Youku. since the videos aren't stored on your hard drive and just play in a Flash Video, it's not like you're illegally downloading them Napster style. i hook up my Acer Aspire One netbook up to a external 19" monitor to watch them so long as i have an internet connection.