I have my Finder window set up to display in "list" view so that it shows all folders with triangles on the left to click to expand. I have a number of levels of nested folders. Is there any way (keyboard shortcut, menu item, etc.) to expand all, so I don't have to click through each level to see the files contained?
Select the folder you want (or command + A to select all) and then press:
And the left arrow undoes what the right arrow did, should you want to close things back up again.