Sometimes you're looking at something in the Finder and realize you need to twiddle it in the shell. One helpful shortcut is to drop the item on an open Terminal window, which types the pathname for you (typically you'd type your command first). You can also use Marc Liyanage's Open Terminal Here Toolbar Script. Once it's installed in your Finder window toolbar, clicking on it opens Terminal and "cd"s you to the folder (directory) you were viewing.