James Duncan Davidson writes about Nikon's comeback versus Canon in the battle for digital SLR market supremacy. The first salvos were Nikon's release of the D3 and D300, and now it's the D700. And sometime later this year, perhaps the D3X. Meanwhile, after years of seemingly being always a step ahead of Nikon, Canon is suffering a tough year.
The truth is that for the average photographer who has committed to either Nikon or Canon, switching is possible but a hassle, especially with a significant lens investment. You can sell your lenses and camera body on eBay and cross brand lines, but for most people the hassle of doing so and learning new controls would be prohibitive. And on a day-to-day basis, it doesn't really matter.
The biggest advance with the new Nikon FX sensor SLRs is the low-light performance. Not having to use a flash except for fill is life-changing.