Another thing I was thinking...and I posted this in a note to a friend but it might be helpful here:
Nikon's AF is extremely adaptable, via the menu settings, to however you need it to be. BUT, it has this weird option called release.
Actually there are 3 options in this menu:
Focus (can't shoot until your subject is in focus)
Focus + release (that allows you to take shots even when the camera is not in focus)
and release (you can shoot away but most often nothing is in focus)
I have everything set to focus in my AF menu banks. But their factory setting is RELEASE. So you can imagine how upset I was at getting all those oof shots when I first got my cameras. Once I found that prackashphotography blog that explained that AF setting, everything was good. Nikon's AF can be so elaborately set to your particular needs that you can practice, change a setting, practice, change another setting til it's exactly what you want. It just takes some time and understanding of the AF system. I would really recommend reading that blog that Mr. Clean linked to...it explains it better than the manual. My settings are pretty much what he suggests in the blog. Works really well too for me.