An alternative to the Midnight Commander file manager utility. It’s available in the Ubuntu repositories (sudo apt-get install vifm) and via MacPorts (sudo port install vifm).
Vifm is a ncurses based file manager with vi like keybindings. If you use vi, vifm gives you complete keyboard control over your files without having to learn a new set of commands.
While you’re getting in touch with your inner geek, don’t forget vimwiki, the personal wiki also based on vim: