Before that it was the D80 I believe... Nikon seems to be wanting to make big headlines with their mid range DSLRs!
I'd call it value for money. Think I will be replacing my D70 with the D7000. So shooting with D90, D200 and D7000. Dual SD cards with the D7000. Very difficult to go wrong in a shoot with everything dualed or tripled including lenses and flashes, unless something gets stolen or what. *touch wood* ;p
Most people have no idea how
useful dual SD slots are for a critical shoot for the pros. Armed with 2 bodies, 99.9999% no failure. Any higher and it'd be D3 dual slots. There are videographers doing real time SSD recording (as an add-on) and then on DV tape. This is similar. I have experienced write errors with the D70 way last time on several shoots. CF card cannot be used on the LCD. Balls rolled into the toilet. With D90 just in April 2010, about 6GB and 3 shoots have quite a number of images lost (the others on D200 and a wee bit few on D70), opened Windows Explorer its ASCII garbage for > 50% of filenames and directories. The SD card reported as over 990+ GB.

Used image recovery to recover, luckily most can be recovered and detected as "good jpegs". Some can only get 80-90% recovery of the frame, so have to open and re-crop using the good jpeg portions. All in all got about 10 times failure in about 600+ shoots. It can happen, even on Pro bodies. You shoot enough stuff, anything can happen and will happen. Usually hobbyists would not experience this, and hence will boldly shoot with 1 body on paid shoots.
BTW which Canon got dual slots? 7D or 5D2?
Another thing that interests me is the "better" metering module. Not sure how good is that. Hope its really good.
I have a feeling that the image reviewing and overall speed "feel" of the whole cam is gonna be fast with the new processor. Sometimes really need to work fast and find the D90 image review not fast enough.