Some settings etc on the following link
http://www.dpreview.com/forums/post/55577911
Lots of other interesting stuff on this site.
Mine arrived yesterday, but I was back from work late. Enough time to charge the battery and fiddle around a bit indoors.
Out from dawn today working outdoors, so will take "The Beast" and my old SX 40 out with me.
Fingers crossed.
Reading through Paul's link, I realized I forgot to mention a couple of settings I'm sure about, maybe cause everybody's agreed about them from the start. First is "image quality" fine, second is NR (noise reduction) low. Third I already mentioned, and that's AF-s (not AF-f.)
Another thing I probably should have mentioned is that manual focus can be set to be controlled by a lever on the left side of the barrel, and you don't have to go into the menu to access MF mode. This makes it actually usable, unlike a lot of superzooms where you have to use the slippery little dial on the back of the camera. And while in MF mode, you can still take a picture using AF just by pressing the right side of the dial and then the shutter.
I'm excited that quite a few here are going to be using the P900 soon, and looking forward to seeing images and hearing reactions from more fellow birders.