Quickly Navigate Up in the Finder
If you're in a Finder window and want to navigate up a level in the folder hierarchy beyond the currently selected level, simply press Command-Up arrow. (You can also Command-click the Finder window's title to pop up a menu of higher levels.)
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Just depends on what sort of data you're storing, and your comfort level with storing that data with a third-party.
And on that topic, my bet is that we'll see an iPad app at some point, but not an iPhone app. But who knows!