After reading the post, I was curious how to do the same thing on OS X. I knew there was a menu for special characters built into all text inputs, so I searche

After reading the post, I was curious how to do the same thing on OS X. I knew there was a menu for special characters built into all text inputs, so I searched help for "characters." The first result was Edit->Special Characters, which showed a shortcut of ⌘+⎇+T. I searched the special characters for "lamda" and selected the first result. After that, I figured out how to easily type λ often. You can add a string substitution in System Prefs -> Language & Text -> Text. No googling. No config files. No restarting X. ♥ My biggest issue was finding the ⌘ symbol, which is classified as "place of interest sign" in the technical symbols category.