Ben Casnocha’s rules of thumb wiki

You'll find it here.  In theory they are for business but what is business but another form of human action?  Here are a few from the list:

Email is a communications medium, not a collaboration medium. When confused as a collaboration tool, efficiency plummets. – Ben Casnocha

A bad reference is as hard to find as a good employee. – Robert Half

Rather than telling an associate, "You look good in that suit," tell the person, "That suit looks good on you." – Dale Carneigie