Perhaps ironically, one of the great technological advances of OS X over previous versions is the availability of a command line. Someday we won’t need this, but today it turns out that the pure point-n-click GUI was something of a premature optimization, and that in fact certain types of users find they work faster and better when typing commands.
While its simplicity is part of its charm, terminal applications invite tweaking. One of the earliest celebrated novelties of OS X was Terminal.app’s option for translucent windows. I initially thought this was useless, but have come to really appreciate it. With the right opacity setting, you hardly notice the background, yet when you refocus your attention you can see it easily. It’s like having on-demand X-ray vision!