I tell people all the time about the "Ford/Chevy" thing (personally I drive a Nissan Titan...but, that's another topic).
I shoot Nikon. I love the feel, weight, ease of control, smell... blah, blah, blah. But frankly I bought it mostly because of the name. I felt that Nikon was respected among pros for the durability and functionality, plus I see a lot of photojournalist with them around their necks. To be honest, I never tried a Cannon. Wait; I take that back. After I got my D70, I was shooting a musical theater production of some such play, and an actor friend asked me to take some shots with his Digital Rebel. I couldn't figure that thing out. I thought things were backwards. All I wanted to do was to turn off the flash!
I started out with an old school Minolta 9000 film camera and I loved the feel of the battery pack and portrait shutter button on the side. I had to re-live that with my second DSLR. I moved from the D70 to the D200 (with battery pack) last year; and when I grow up... I'll probably go for the new D3. But buy the time I can afford it... it's gonna be a D14!
If anyone has a friend at Nikon that's giving away demo D3's... I'm willing to test drive it for a few years.