It is always handy to have a list of keyboard shortcuts to use while using a Mac computer. One of my Twitter friends and Seattle's Mac guru, MacBlend has a great app that supplies you with 101 Keyboard Shortcuts and a quiz to test you on what you learn.
Matt at MacBlend, also provides training sessions in person or via video chat training using innovative means to learn all about your Mac computers. He has a great site which has lots of useful information. You might want to check out his clever videos under the MacBlend TV tab and his FREE eBook entitled "20 Ways to Save Time on Your Mac". I highly recommend following his blogs and check out his site to schedule a coffee session for some useful tips and guidance in making the best of your Mac computer.
I look forward to the future MacBlend apps and updates. I am hoping that he will add in some search capabilities to help find a specific shortcut within the 101 Keyboard Shortcuts for Mac, or possibly a reference list by Mac App or type of keyboard grouping. For example, it would be nice to have a section of just those screen capture keyboard strokes together on one screen or to pull them up if I searched by tag "screen capture".