Learn a new keyboard shortcut every day
After getting a few requests for keyboard shortcut tips from his coworkers, Mack went and set up a new blog. Sure, there are plenty of places on the web where you can find lists of keyboard shortcuts. But it's nice to just find one new shortcut a day to focus on. It's sort of like flipping through a word a day calendar. You don't become a wizard overnight, but by the end of the year, you've expanded your vocabulary.
There's just a few tips up right now, and they might seem pretty obvious (hit the Windows key to bring up the start menu), but there's a few hidden gems in there. For example, I didn't know you could also bring up the start menu by clicking Ctrl+Esc if your keyboard doesn't have a Windows button.
Mack's list appears to be Windows only, but there are plenty of resources out there for Mac and Linux users.