A couple of features I used recently struck me as being very good examples, eg:
With help like this, you can hardly go wrong. The static option is absolutely clear and if you choose a dynamic one, the correct format will usually be taken care of automatically.
It's not always be possible to display all the information as clearly as this, so informative popups like this work very well, eg:
With a few more popups and clear information as in these examples, confusion could be much reduced. Just a thought.