Thanks dude!
I've read this some time ago and it really is very detailed.
Seems like D90 really has an edge when it comes to picture quality.
To be honest, I wouldn't worry too much about such conclusions.
The (claimed) difference is unlikely to be noticed by any hobbyist.
More important is if it feels good to use, is at about the right price, and has all/most of the features you wish for the camera to have.