I should also add how incredibly impressed I am with the high ISO capability of this thing... It may sound jovial to some on here with a D3s or whatever other ISO-monster's there are, but I've never (happily) shot above ISO800... always started getting noise... and noise... well... I hate it! This thing will do ISO 3200 and get the same level of noise as the D90 did in the 6-800 range. While going above 800 on the D90 is, of course, possible, the results were not to my liking. Shooting at 1600 on the D700 I found no noise, which to me was very impressive. I'll definitely, thanks to this feature, be doing a lot more available light shooting in darker environments. 75% of my work is done in available light... I feel like that number's about to go up an extra 10%. Nikon's doing it right!
Last thing... When looking at the D700, I was very seriously considering just saying "eff it" and jumping onto the Canon band wagon with the awesome EOS 5D MK II... I wasn't THAT deep into the Nikon glass game that I couldn't just sell them off and start fresh. With a 70-200 f/2.8 VR II, 135 f/2 DC and a 50mm f/1.8 it wouldn't of been that tough. The 5D had things going for it that the D700 didn't... higher resolution, 1080p HD video (HUGE to me), etc. While even the next generation D700 (whatever it'll be called- be it the D900 or D700s) almost certainly won't have as high a resolution or as good video recording capability, I'll still be happy I went with Nikon, and here's why: it just feels so much better in my hand! Might seem like a minuscule detail when it comes to a trade off as big as higher resolution and HD video, but to me it's worth it... the ergonomics are heaps better, to me, than those of the Canon's. Not to mention there's a button for everything so that you're not left scrolling through menus for longer periods- periods during which you could be shooting! On top of that still, there's the Nikon glass... which to me is the best out there. No doubt Canon makes some real gems, like the 85mm f/1.2 (drool), but Nikon is 'it' for me when it comes to lenses. Even thought of going the 5D MK II route and just grabbing an adaptor for use with my Nikon's. Ergonomics and glass aside, I can't say those are the only reasons I went with the 700... I mean, aside from when I'm cropping and don't want to lose resolution/clarity, how often would I really utilize all the megapixels the Canon offers? As for video... while I'm without the ability to record video now (something that's significant to me, since I'm into making short films), I'm sure the next D700 will be great at it... I'll just have to wait until then.
I'm not some crazy Nikon fanboy, I'm just a passionate student photographer who shoots with what he likes and feels comfortable with. No brand preference here.