I am using D90 too, not sure if you had went through the boring manual yet. If not you can try getting this book "Nikon D90 Digital Field Guide" by J. Dennis Thomas.
It cover plenty of features and usage of the D90 plus basic photography shooting.
There are also alot of information at the Newbies corners... you can start with this.
I am using D90 too, not sure if you had went through the boring manual yet. If not you can try getting this book "Nikon D90 Digital Field Guide" by J. Dennis Thomas.
Me, three.... quite handy for a beginner to learn your new toy...