Congrats on the D90.

One of the problems SWMBO has had with her Nikons is fine dust getting into the camera. Very difficult to combat when outback touring as its impractical to keep the camera locked up in a carry bag. Defeats the purpose of having the thing in the first place. By the time you get it out the birds flown off.
What Kaye did was nick one of my soft padded fishing reel bags with a draw string closure to hold her D80. Its cheap light and convenient and affords a fair bit of dust and knock protection. Its also quick to remove and you can shove it in your pocket.

Deano