If anyone ever has any questions about polyamory, by far my favorite resource is and has always been the More Than Two website. The author, Franklin Veaux, is an excellent, insightful writer, and has some fantastic advice, a lot of which I think is actually applicable to monogamous relationships as well.
Much to my delight, Franklin and one of his partners are working on a book! They will be relying on crowdfunding to get the process going (you bet I’ll be donating!), and their Indiegogo campaign will launch on August 22nd. In the meantime, I highly recommend checking out the articles on his site, and also reading the book blog for a further sampling of their writings.