GFX Hotkeys App
Check out this for a cool app from the Apple Store. It's called GFX Hotkeys. It is a universal application that includes a full list of the hotkeys for most 2d/3d applications. Everything is organised by category and you can also easily search through everything. You can even display hotkeys based on operating system. I must say that it looks pretty sweet on the Retina Display.
Get the app here
