I pulled the plug on Comcast over six months ago, and I love it. I bought a Dell Inspiron Zino HD 410 and hooked it up to my big ol' TV. It has HDMI out which actually sends the audio as well, since this computer is designed to be TV connected. It does a great job for streaming Netflix, Hulu, and Amazon VOD.
I'm saving $60/mo., and enjoy a better experience. On demand streaming is wonderful, since there's so much out there to watch already. I do have to be patient, waiting for TV shows to hit Hulu or movies to hit Netflix, but it's been worth it to me.
The only thing I really miss is the ability to just sit down and let the flashing box entertain me. Now I do have to make a choice. Before, I could sit down and let a Mythbusters marathon entertain me. I can still do that, but I have to think to do it before I can do it.
I've also been spending more and more of my time watching podcasts from TWiT
and others. I watch very little actual TV these days, only those shows I really want to see.