Well now with the D300 and D3 and all future models Noise will no longer be a problem for Nikon. And with the price of the D300 just around the same as a used 5D I have a feeling there will be more and more Nikon people in the future.
I shoot canon but I have been eyeballing the Nikon D3 for a while...
I believe that Nikon is taking over. If you want alot of megapixels go with canon. They are the megapixel masters, but that's all canon kicks ass at right about now. But who really cares about how many megapixels your camera has, it's not going to help you make better photos... With Nikon I believe the images are more sharp and crisp because I think they have better glass. But Nikon is alot more expensive than Canon in all aspects. The canon 24-70 L can be purchased for about $1200 the Nikon equivalent is close to $2000!!! Actually I think the Nikon 70-200 VR is cheaper than the Canon 70-200 f/2.8L IS, if not cheaper it's the same price. So higher cost might not be a factor with all nikon stuff.
But I do know that Nikon cameras let you TWEAK things more so you don't have to do soo much post processing. Can do all kinds of color adjustments and contrast and saturation, all kinds of adjustments. Yeah you can adjust all that in canon bodies also but not to the extent you can with nikon. Jesus they even have built in Cropping and levels and all kinds a stuff. You can crop and adjust levels on images IN CAMERA! Not that that's a big deal or a necessity but it's a cool little feature. Also a cool feature that I just saw a few weeks ago with the D200. It has a built in wireless transmitter when you use the internal flash, so you can fire external flashes! To me that is really awesome! 
If I could start over again I think I would go with Nikon. Maybe this winter when work slows down maybe I'll switch over. But then again.. maybe not.
Either way you decide. A camera's a camera, anything will take great images in the right hands...
=)
Canon 1D Mark III -- Canon 5D
L Lens Travel Kit = 70-200 f/2.8L IS · 24-70 f/2.8L · 16-35 f/2.8L
Non-L Primes = 15mm Fisheye · 50 f/1.4 · 85 f/1.8 · 100mm Macro
Alienbees lights (6) + Ringlight + Vagabond II
Nikon SB28 (3) · Nikon SB80DX (1) · Canon 580EX (2) · Pocket Wizards (7)
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