Photoshop CC Quick Keys Cheat Sheet by John Coates
John Coates has put together an amazing resource on his blog. An easy to use reference to help speed up your Photoshop workflow and help you memorise the program's many quick key combinations. An absolute must have for Photoshop users.
Comes in both Mac and PC versions and is high res enough to be saved as your desktop background (so you never get lost again).
All credit to John for this great resource.