One of the keyboard shortcuts that I use multiple times each day is to bookmark the currently viewed page while in Safari:
CMD + d.
As I read the various articles in my RSS Client, Vienna, I often want to add a bookmark of the page for later reference. Using the keyboard sequence of CMD + d is faster than clicking through the menu bar.
This isn’t a huge time savings, but again it is one of those quick keyboard sequences that will save you a few seconds each time you use it. Every little bit helps when you are trying to make your day more productive.