I've read books on Lisp, but to say that I've learned it or written a program I would admit exists . . . the counter is still running. Hope springs eternal.
Common Lisp, but I was reading about Lisp in BYTE magazine before CL existed, in the context of AI. I was also exposed to the work of Terry Winograd, particularly SHRDLU.
vim, usually without remembering to turn on its fancy features, so it may as well be Bill Joy's vi.
BASH
I've been advised to learn Emacs and its Lisp along the way.