story
I use Awesome Window Manager and one feature I like about it is this:
Say I've got my terminal in workspace 1, Firefox in workspace 2, and Emacs in workspace 3. There are often times I need to use either the terminal or Emacs (or both) while viewing a website. So with a keystroke, I can tell it to combine any two or three workspaces and all the windows are shown tiled together. In a sense, it creates a new temporary workspace with all 3 windows. As soon as I leave this workspace, it restores it to the original configuration. No need to move windows from one workspace to another and remember to move them back.
This is the one feature that I'm really missing from Mac OS.