I've been silently reading posts from here and really enjoy the
discussions and really glad to see the vibrant community growing.
Just want to post this to shamelessly market our own iphone game that
is geared toward designers that is called Helvetication.
It's a game that trains you to learn helvetica and makes you spot
differences between Arial vs Helvetica in split seconds.
To prove that you actually know Helvetica, you should definitely try
it out :)