List your favourite CLI programs. :)
Even though I'm in GNOME most of the time, I still use irssi, and MOC, nano. I've started to use grep a lot more than I have been. For the longest time, I could never use the darn thing, but, I guess as time serves you get accustomed to what is used. I also use Find, and Locate.
That's pretty much it, or at least all I can think of right now.