I've learned quite a bit from some of my mistakes "recently," as most all of us do.  However, with that said, I've learned a great deal about business etiquette in general.  As a "work at home" professional, I realize more and more how we can all learn from each other (within the same industry).  

Networking should be the most important aspect of our home businesses.  If everyone of us would treat "everyone" with the same respect, loyalty, and kindness that WE would like to be treated in return, then that would give the "professional business relationship" a whole new meaning.