Now, there are a lot of free online TV shows on the Internet. If you think you don't have time to watch online TV shows on video websites, then you can use software like Last.fm, Pandora, Deezer or Slacker to record the TV shows from those video sites and watch them on your computer.
If you're on the road and have lost your TiVo, you can use either Sling Media's Slingbox or Sony's LocationFree mobile video system to watch DVR content that you download online.