Can't remember all the Unity keyboard shortcuts? Then check out the AskUbuntu keyboard shortcuts thread - you'll find two wallpapers (one is also available in German) with most of the Unity mouse tricks / keyboard shortcuts:
Unfortunately there's no SVG available so if the wallpaper resolution doesn't match your monitor, try tweaking it via the Appearance preferences (stretch/zoom, etc).
Get the full-size wallpapers @ AskUbuntu
[via Novatillasku]