Considering Nehalem is only being sold in 130W TDP batches on the X58 chipset it's not prime time for the iMac. Do some more research about Nehalem first. You can't just go about saying that you want an i7 when it's not even in cooler standard desktop and mobile variants.
Ah, alright, this makes sense. I just find it unfortunate that they have to use such dated chips in a new release.
Can we have a midrange Mac desktop with Core i7 yet?