I can't seem to get my Mac or PC to read the memory card from the D90. I can see all of the files on the card while it is in the D90, but when I attach it to the computers, no luck. I have two different memory card readers, but neither seem to work. The card is a Sandisk 8 gig card. Any thoughts?

Hmmm... mine just pops up on the desktop when I use a usb card reader. Have you tried installing Nikon's transfer program that came with the cam and pulling the files straight off the cam via usb?