Ron, if you want to "nerd it up," Rob Galbraith has memory card info sorted by camera. Here is the D90 page: http://www.robgalbraith.com/bins/camera_multi_page.asp?cid=6007-9597
The D90 page hasn't been updated it a while, but it should give you an idea of what cards work well and you don't...
While I love RAW shooting and recommend it for most shooters, I'd recommend that a newbie shoot JPEG when they are first learning. If you can learn to nail your exposure and color in the camera, you'll be much better off.
Congrats Ron. I've been following the thread, but didn't want to add to all the noise, I mean advice you were getting. :) I figured there were already enough voices in your head and in all seriousness you were getting solid advice.
Now that you have a camera, get out and shoot. There have been...