I live in a village in the midlands in the UK, our area was recently upgraded to fibre-optic broadband so I though I might as well give this OnLive thingy a go.
I was gobsmacked; in my little village, on a laptop, with poor signal from my router I could play 30 minutes free on any game they had in the store with full graphics in 1600x1080 (HDMI to my TV). It may not take over quite yet, but I hope it does well, this service is amazing.
With my 1 game for £1 offer I bought Deus Ex: Human Revolution, did a short commentary on it and posted it to a friends YouTube channel; I have been an avid video maker ever since.
One thing I would love to see is this service, or one like it, being bought by Google. Just imagine how far it would get with all those servers, existing clients and investors. If OnLive gets more games and some modding support, I think it could take over console gaming before the next generation is released.
Edit: OnLive currently only supports up to 720p. They're focusing on reducing the connection quality needed rather than improving the stream, which I think is bullshit; I have 25mb download at peak times, connection is not a problem.