Can I set up Nautilus to use transparent background?

I think it'd be nice if Nautilus windows could have semi-transparent backgrounds (same as Gnome terminal can) for files and places lists. Is it possible?

You can use Compiz settings manager (you need to install "compizconfig-settings-manager" package, and then run the "CompizConfig manager" from the "System->Preferences" menu).

Under the "Accessibility" item, you have "opacity, luminosity" option. There you can define the opacity (and then, transparency) of your windows, and you can set it based on the window title or type... If you create a new item here, you can type "class=Nautilus" and select the transparency you want. Then all Nautilus windows will be transparent.