I went looking for US cable tv stations but found none, i was reading about a site called iCraveTV.com in Canada which a few years ago attempted this but was shut down for copyright infringement.
I have tried programs like tvonline, worldtv(which seems to be made by the same folks as tvonline) and vtuner but all the tv programs are crap and you can get them from the sites below anyway.
If you know of any links for cable tv stations let me know, but i doubt there is any.
Here's a few online tv links
http://www.dsltv.nl/ - your need a netherlands proxy to access the staions