I recently found a D90 user's guide written by Ken Rockwell that is awesome! He goes into detail on every function, feature, and menu item, and explains what it does, and what he changes. It was VERY helpful when I was learning my D90. He has manuals for most Nikon SLRs (but no Canon guides for some reason) from the D40 up to the D3. I'm sure many have already seen them, but for those who haven't, please check out the full listing I made on my blog: Ken Rockwell Nikon Camera User Guides He allows you to download them, but asks for a $5 donation if you do. In my opinion, it's worth it. Enjoy!