Here is an interesting plugin I came across today that stores every button you press with the mouse that could be used with a keyboard shortcut. It currently supports toolbar buttons, menu buttons, and tool windows and the actions.
I installed it this morning and it stays out of the way until you want to look at the stats and add a new shortcut to memory.
For me, more than learning the missing shortcuts I like it to show me areas of the editor that I’m commonly using and it’s a little more in-depth than the “help -> productivity guide”:
Eric L. Barnes 