I find having core peer groups (I like to call them "cronies" just for kicks) to be invaluable. We share with each other information about our businesses and challenges we face that we wouldn't share with others. We check in with one another and hold each other accountable.

I like to think of it as like being investors in each other's companies, but with no money exchanging hands, and no complicated term sheets. Each success for one of us results in more success for all of us.