Wow. Doing a little research on earlier flagship Nikon camera's (and comparing them to Canon camera's); they absolutely SUCK. CCD sensors and 4MP while Canon was cranking out CMOS' with 8MP and higher FPS. I'm surprised Nikon didn't go bankrupt in the early 2000's.
Then the D3 comes around and BOOM, Nikon seems to be back. FX sensor with 9FPS... This is the first time I'm really taking a look at Nikon camera's - I never really liked the ergonomics (and the shutter sounds horrible imo), but I actually might have to take another look if I could like 'em. For the price (D3/D700) they seem MUCH better camera's than what you get for the Canon equivalent.
As far as 7D vs 1D mkIIn goes, the 7D wins for me there. About 200€ more than the 1D, but it works better for me: higher ISO, video, more resolution, 14-bit images and, probably the biggest advantage, it's much smaller.
I'm more on the fence whether I should look into Nikon's too...