The i7 chips are great... for 3d/2d rendering they are just amazing.
My little 920 beat dual Xeons in a Yafaray rendering benchmark using Vista64... and I don't even know what I'm doing really.
The only higher scores were using Linux, which I haven't tried yet.
I'm sure I could get the top spot if I try out Linux (unless one of you i7 owners want to get over there and give it a shot).
YafaRay | Free Rays for the Masses
i5 looks like it's going to be great too.
It'll be really interesting to see where this all goes from here...