This may or may not work for you. I found it on a CNet posting:
http://reviews.cnet.com/4520-10165_7-5643378-1.html
Opening the case
Turn off the iPod, and place the hold button on (so that orange is showing). Insert the edge of your tool of choice vertically between the plastic and the metal, next to the FireWire port. Insert the tool as far as you can, then slide it up and around the sharp metal upper-left corner of the iPod until it's about 10mm from the edge. At this point, pry up and release the first of the five clips (on the left side) holding the two case halves together.
Once you've released the first clip, continue to slide the blade down the side of the iPod, and the remaining four clips will come apart fairly easily. With one side of the iPod case released, you can now lift the plastic case half away from the metal portion. With it will come all the electronic components, in one unit. Congratulations--your iPod is now open!