How to burn an iso/dmg/cue/bin image or a folder in OS X?

Well, just open Terminal.app (apple+space brings up spotlight, start typing terminal, then cursor down + enter on it - there you go) and type:

drutil burn path/to/image.iso

OR

drutil burn path/to/folder

Even the command line is simple. Also erasing a rewritable? Yes, you guessed it right, drutil erase.

Cool!