OK, probably *everyone* knows this already, but if not, here goes:
In Finder, right click (ctrl-click) the toolbar and select "Customize Toolbar..."
Now drag the new-in-jaguar "Path" button to your toolbar. Click "Done".
Now you've got a *much* easier way to go up directories than the column-view method of moving the scrollbar or using Apple-Up. And you can jump up multiple directories at once.
Thanks to the Apple Store in Cambridge MA and Nik Clayton for that one.