To follow on from Dave's post yesterday, I found this article comparing the high ISO between the two rival bodies.
So looks like the Canon gets a kicking on both ISO and AF.
In the UK, the Nikon is a clear £600 cheaper too. I know, if I was in the market, which way I would be going now, that's for sure.
By the way, I haven't forgotten that I promised more on the Canon 7D - will start writing over the weekend