For me, one of the undervalued timesavers which I use all day, every day, is Safari's ability to navigate pages simply by hitting Command and a number, to move from sites in my Bookmarks Bar. If you use the Bookmarks Bar to contain your most frequently-accessed sites, in addition to folders, hitting Command-1 will select the leftmost site, Command-2 will hit the second in line, and so on. Now, instead of moving the mouse and clicking on the shortcut, or entering the URL, you can rapidly move through your daily Web surfing.
That's the idea behind my most recent contribution to The Apple Blog, titled Safari Shortcuts a Big Timesaver. Per agreement with them, I will not be cross-posting the piece, but instead, have provided a link. Enjoy.