Smart Folders have been around in one form or another since OS X Tiger. For a while, the Finder’s sidebar included a dedicated Search For section, with predefined Smart Folders that displayed apps and documents you used "Today," "Yesterday," or "Past Week." There were also Search For entries for "All Images," "All Movies," and "All Documents." These smart searches were a popular feature and served as an introduction to what Smart Folders could do. Now it's time to dig a little deeper and discover some of our favorite saved searches.