I am a cognitive scientist (Ph.D.) who studies the workings of human memory. The number one thing you can do improve your learning is to QUIZ YOURSELF.
Every time you retrieve some information from memory, you STRENGTHEN that information in your memory, making it easier to retrieve again in the future. So when you study new information, DON'T just re-read it multiple times. Read it, then quiz yourself (try to remember the info on your own), wait a while, quiz yourself some more, quiz yourself again later, etc.
Key terms: "testing effect" or "retrieval practice". For example, here's just one peer-reviewed psychology publication that summarizes relevant scientific research, and some implications for education: Roediger, H. L., & Karpicke, J.D. (2006). The power of testing memory: Basic research and implications for educational practice. Perspectives on Psychological Science, 1, 181-210. [PDF]
Interesting idea. But keyboard shortcuts are easily discoverable in Mac OS X. Open any menu, in any application, and keyboard shortcuts are listed right there alongside the commands. Seems like a good solution, but users still need to be trained to understand what the cloverleaf symbol means.
Okay, but there is one obscurity: try holding a menu open and pressing the option key. You may have to try a few different menus before you see the secret.
The system was down for backups from 5am to 10am last Saturday.