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^ That worked in previous versions of OS X, but I think that Tiger (or was it Panther) did away with the .hidden file. Nowadays you'll need to use an app like XRay to set the "Invisible" bit for the folder.
Ticking sound coming from a .pkg package? Don't let the .bom go off! Inspect it first with Pacifist. Macworld - five mice!
FWIW, if you open a hidden folder such as usr, it will remain visible until you either quit and re-launch the Finder or log out and back in or restart.