We recently upgraded the video capability at our house so we can stream directly from the Internet in addition to watching satellite TV and DVDs. If you are considering this upgrade for yourself, I cannot discourage you strongly enough. It's a terrible idea. Don't do it. In the name of all that's holy.
Netflix Streaming doesn't have everything you can get on DVD from Netflix, but what it does have is more than enough to keep you from doing anything productive for the rest of your life. I have been watching the original "Hawaii Five-O" pretty much professionally for the last couple of weeks--with a total of 279 episodes available, it'll be months before the laundry gets done again.
The great thing about streaming, as opposed to getting DVDs by mail, is that if you put something in your queue, watch a little of it and decide you're not interested, you don't have to mail back the disc and wait for the next one to come. You just go on to the next thing in your queue, and before you know it you're back in an uninterrupted (and uninterruptible) video coma.
There are other some great things about having streaming video capability on your TV, but I haven't got time to tell you about them now. Steve McGarrett's got a lot of crime to fight in Hawaii, and I'm not watching him do it, he'll never get done.