Wow! I was typing in TextEdit.app (The Mac OS X equavivilent to Notepad) and in the middle of a word happened to press F5. Guess what? A completion drop-down dictionary appeared. And it’s there even here, in the Safari TextArea control. I guess it’s a Cocoa feature. But it’s weird that I’ve been using Mac OS X for almost two years without noticing. What other features are there, waiting aroung the corner? Please tell me if you know!