When navigating the Finder in column view in 10.6, the system now allows the use of Tab/Shift-Tab to go forwards and backwards in the folder hierarchy. Unlike (for me at least) 10.5, the arrow keys also work reliably for that now.
Another interesting tweak is that using Tab/Shift-Tab does not change the current working directory, so you can hit, for example, Shift-Tab three times, then hit Right Arrow once, and you'll be one folder deeper than you were when you started.
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Mac OS X Hints
http://hints.macworld.com/article.php?story=20090910123550215