Do you Hulu?

If you own a computer with respectable bandwidth and a quality screen you should be watching television at www.hulu.com .

You can take your shows on the move and organize them with all the ease of a DVR or Tivo, but for free! Granted, you can't see everything that's on the tv. Almost everything, but not quite. For your HBO I'd recommend getting HBO on Demand. It's cheaper than real HBO and convenient.
But back to Hulu....
There is also exclusive web content, which is pretty neat on shows like The Tonight Show, The Office and the deceased Battlestar Galactica.