One of my favorite Stickies features is the ability to make a sticky translucent. Just click on a sticky and press Command-Option-T (Translucent Window). Then you can see right through your sticky to the items behind it. This is really handy if you want to see items in Finder windows that would normally be covered by any open Stickies. To turn off the transparency (pardon me, translucency), just press the shortcut again when Stickies is active.