I use everything
I do have Netflix so I watch a lot on that, but I have a whole folder of places to get video
All depends on what I am looking for, hulu/nbc if I want to catch up my 30 Rock obsession
Youtube's full movie and episode selections are slowly getting a little better too. I haven't had cable TV for 2 years now, I can see virtually anything I want to on the net these days. I have a very small place and movies on my 22" widescreen are just fine for me, tho my vid card could hook to an HD tv as well.
It is mostly perfect streaming, but occasionally I do get a buffering hitch when net traffic is heavy. I'm on a 3M dsl connection and rarely get that.
Long live free video!