apparently OSX does it natively too, just at the bottom:
(special thanks to cohort Kent)
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December 18th, 2008 at 1:51 pm
Listen my little peons-I know about the bottom of the Finder.
My solution shows a file path at the top of the finder with economical use of space (I don’t need to see a file icon for ever step in the path). And it doesn’t require Windows.