You can also make invisibles visible however you wish (there are so many methods - I like MainMenu in my powerbook menubar, replaces numerous utilities) and drag that dot-trash folder into the Sidebar, where it remains visible (I don't know why, but don't tell Apple, they'll take it away) and thus is forever handy for examining contents, just like any other folder there.
I suppose if you've got some other invisible folder you're really enamored of, same thing applies--but you shouldn't have one. <gr>