How many folks are in, or have had, successful polyamorous/ethically non-monogamous relationships? I don't think you have to be involved with more than one person for your relationship to count as a successful poly/enm relationship.
What makes your relationship(s) work? What made them work?
Did you make any agreements early on, or later?
Please elaborate on anything you feel is pertinent to successful relationships. Promise I'll be back at some point to share my experiences.
Please save the horror stories for a separate discussion about abject failures.