FreeFilmSoftware.co.uk SLang is story-development software. It allows you to write events for your story as "virtual index cards" and print them out. SLang allows you to export your story plan to ScriptMaker, the screenplay writing software which you may also download from this site.
Select Layers by ⌘ clicking them - Photoshop Secrets (also, with the Move Tool selected, if you right-click the canvas, it'll show you a contextual menu with all the layers that could be selected by clicking that spot under your cursor. Cool!