The command line comeback
Lifehacker has a great article about the comeback of the command line: "Geek to Live: The command line comeback".
It is one of the best articles I've seen explaining the difference between a GUI and CLI in terms of easy of use versus efficiency and one of the more convincing ones for the fact that CLI is not dead and that indeed it is actually gaining steam in new and interesting ways.
This reminds me of ideas Taco (tbuitenh) has for new kinds of user interfaces which would combine the best of both the CLI and GUI into the perfect balance between ease and efficiency.
And we have a whole forum here dedicated just for command line computing!