We have a TV. But all the channels are in Thai. So we use iTunes and subscribe to a bunch of video podcasts. It's not exactly the same as cable TV, but it works. One of the more interesting podcasts I found was the Office 2008 for Mac podcast. I've found these short show to be quite informative, typically teaching me stuff I didn't know you could do in Office. So fire up your copy of iTunes and do a search for Office 2008 for Mac.
What video podcasts do you subscribe to?