As we all know, there are approximately 2.4 bazillion shortcuts to LR4. Adobe documents most of them, but not in a way I would consider "user friendly".
So, I took the 10+ rambling pages of keyboard shortcuts from the Adobe Lightroom 4 site, and reformatted it down to fit on just five pages. I also tried to format it such that all of the commands for a module were on one page, rather than rolling across two or more. I thought I'd share it here in case someone else could benefit from it. I also printed it to PDF in case some folks don't have Word etc.
P.S. Apologies to the Apple users, but to make it fit I had to delete the column of Mac OSX commands. If someone wants, they could probably do a search-and-replace in the Word doc