I have just purchased the new D700 a few weeks ago - have been testing it on a few jobs already and it simply rocks! Finally starting to fully enjoy digital photography. I was just about to buy the D3 and thank God I spoke to my dear friend Laurent who advised me against it - I have no regrets. It is a smaller body, holds perfectly well in my hands, 12.1-megapixel FX-format (23.9 x 36mm) - Everything i have been dreaming of and more. It is the perfect tool for a photo-journalist, reportage, wedding photographer. Well , I just rave about it but I am really exited to look at the images on my screen! It is the best thing Nikon has come up with in a long time.
Here is the best review around comparing the D700 to the D3 Nikon camera .