"My issue with Canon: Warranty is only 1 year (nikon 2 body, 5 lenses) Focusing problems and last I could newer trust the exposure when using a flash, special when backlit, open door in the background (some weddings have a open door/window behind the bride as she walks up the aisle, which my Nikon d300/SB900 exposed right on)
Yes my Nikon(my friends D90 same thing) has to be set at minus .5 in exposure or I feel most pictures turns out a bit to hot, but that is just a setting (I do think that Nikon should firmware update them to have that adjustment done)
I also find pro lenses to be better quality form Nikon but a bit pricy, My Canon 24-70 performed poorly and only slightly better after Canon service my 70-200 was better but no where near the sharpness of my Nikon 70-200VR"
Oooh I could use you on the birdforum I'm on! I took a stand there and said that Nikon generally had better optics. As usual on that forum, they came back with the "each is as good as the other" arguement and in a backhanded way, insulted me just for having that opinion.
Anyway to answer the question, the D90 is a great camera and it's only about 10 months old. It won't be replaced anytime soon. At least not that soon.