Is it possible to uninstall OSX?

I recently had to install Leopard on an external hard drive so I could boot my Mac and fix a problem with my internal hard drive - mission accomplished.
Now my problem is that I really don't want to keep OSX on the external drive - but there is other data on the external drive that I do want to keep and of course I have nowhere else to store this data at the moment. Thus reformatting the drive is not an option.
So, is it possible to uninstall OSX from my external drive or is reformatting the drive the only way to get rid of OSX?

You can dump the /System directory, but there are a bunch of invisible directories on the root that will still be taking up a good deal of space on your machine. /var, /usr, the mach files etc. are just a few. There is no OS uninstaller that I know of, Apple doesn't have anything built into their install disc other than options for wiping or reformatting a hard drive.

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