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Somewhat obvious reminder...
Authored by: victory on Fri, Apr 25 2008 at 12:13PM PDT

...if you're concerned about running the aforementioned 'erase free space' operation on a 'live' filesystem, you may want to shut down your system and reboot with your OSX install disc and run Disk Utility from there instead.

Or, (in keeping with the spirit of the original hint of using the cmd-line) reboot with your OSX install disc into Single User mode (documented elsewhere) then use the diskutil tip mentioned earlier.