Canon made a big leap over Nikon (in the pro market) with the EOS system. Nikon was slow to respond, but recently they have taken the lead in pro cameras.
I bought a 40D and as soon as the D300 came along I knew I had made a mistake staying with Canon. The D300 was better, but not enough better to make me switch ... then. When Canon came out with the EOS 7D and the POS 60D that clinched it.
Now I have both Canon and Nikon bodies and lenses (no kit lenses for either). My next lens purchase will be another Nikon prime. Will I buy more Canon in the future ? Hard to say, but I see nothing that has been announced/rumored that I'm interested in buying. But Nikon has several things coming I'm waiting to buy.
Nikon's Professional Mirrorless system sounds interesting (and innovative). If it is as good as I hope, I'll order a body and some lenses the day it is announced.
Try to remember that cameras are just tools. Way too many people base their self worth on the kind of camera they have, the make of car they own and the brand of beer they drink.
BTW P&S cameras are quickly being replaced by camera phones. What will be the camera makes response ?
I use both Canon and Nikon, do you have a problem with that