A rather excellent post for authors on how to write convincing poly relationships.
There is a wealth of information in links at the end -- and it's a great central place to send people who are looking for some Poly 201-level information (because she's talking about how real relationships work, in order to write them well, and the linked articles are all about real-life polyamory. I particularly liked
"From two to three: Advice on opening up from an HBB".)