I have to agree with silks on the differences. In my opinion, the power difference between say, the Wii and the PS3, is closer to the power difference between the N64 and the GameCube.
It's just, the rate of improvement isn't as noticable due to the fact that the Wii can show enough polys and what not to make models look smooth... if you get what I'm saying. But, yeah, if we are talking raw horsepower, I think Lindy is close to the mark.
If anything, this just proves that there is a lot to be said for what Nintendo's main point is. Power isn't as important anymore BECAUSE the GameCube could make stuff so pretty.
I mean, look at the two most obvious places the Wii comes up short to the PS3 and 360 in my opinion.
1. Being able to run at HD resolutions.
2. Potential Number of characters on the screen.
Notice how neither of these are poly count, which was all we cared about going from n64 to GameCube.
So yeah, regardless, I think Nintendo obviously made the right decision by, what is in essence, skipping a generation as far as raw computing power goes.
That said, I don't think this strategy will continue to work in future gens, and by that I mean, I don't think they can afford to fall more than one generation behind. So the next system better be more powerful and run in HD... but I'm sure it will.