Forgive me if this is well known but I thought I would share something I recently discovered and it is in the spirit of Jon's CLI guide in the current issue. I accidentally fat-fingered a function key whilst in a Dolphin window on KDE and what popped up at the bottom of the window? A terminal session. How cool is that? It's F4 if you want to try it out.
I do most of my computing in a GUI but sometimes I find the CLI does things better, for example checking md5sums. OK, it's not a major chore or hold-up to launch konsole but I was none-the-less impressed. You even get dropped into the same directory Dolphin is in. As Graham said in episode 20 of the tux radar podcast, KDE is awesome.