<a href="http://headrush.typepad.com/creating_passionate_users/2006/02/its_the_stupid.html">"It's the [?], stupid!"</a> is another great post by Kathy Sierra at <a href="http://headrush.typepad.com/creating_passionate_users/">Creating Passionate Users</a>. It puts the spotlight on the most meaningful feature of your service or product. Do you know what it is? 'Of course!', you might respond. 'I'm not stupid!' Well, you might be.