I recently replaced the battery in my iPod with a kit from ipodjuice.com that included an extremely effective tool for cracking open the case.  The basic principle is similar to the most excellent instructions Tommy Tyler posted, except that one half is metal and there are things poking through to be minded.  It didn't leave any marks at all, and I have found that the tool is just as effective in cracking open a remote.  I see they sell the tool alone for $5 plus shipping:
http://www.ipodjuice.com/ipod-battery-r ... s-only.htm
			
			
									
						
										
						Tool for opening the case
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				underquark
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				Tommy Tyler
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