This was indeed a tough shell to crack! The plastic tools can bend easily and become weak so be careful as you are trying to create the initial gap for the putty knife. Once you get one side unhinged, the rest moves much more quickly!

Upgraded my 80 to a 120 and did the battery while I was at it...now hopefully I can squeeze another 5 years out of my iPod which should be long enough for a Apple to release Touch with a large enough hard drive for all my music!