How can I watch cable tv on my computer?

Oh yes there is. You need a TV tuner card (also comes with a remote). You just need to make sure your computer is fast enough to "stream" it back without it being distorted (lips matching up with sound correctly), you will also have yourself a DVR too this way. This is what we just did instead of paying for a DVR anymore! Price them out at tigerdirect.com or bestbuy.com, I think they are around $100.

There's a piece of hardware called a "TV Tuner Card." It's one of the earliest ways to record or watch TV on your computer. You can pick one up for less than $20, if you don't mind installing the card yourself: http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1951869&CatId=1427 If you don't mind spending a little bit of extra money, you can get one that fits into your USB port: http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=2971272&CatId=1427 That way, no opening of the computer and making a mess!