We connected our computer to the TV so that we can stream from the internet since we don't have cable. We prefer it because we have an HD TV and regular cable doesn't look good on it, and I don't like paying extra money for HD on cable.
Typically, we use certain sites to watch movies or shows, either downloaded or streaming.
I also have a DVD drive in my PC so I can watch DVDs and everything on it! So, we have a variation of ways we watch!