There's a good article on compersion on the women's sex and love webzine YourTango.com. I love that this subject - something most people have never heard of or even imagined - is being explored on a women's mainstream venue. Too cool. It concludes with the following words:
These women are unapologetically happy with their non-monogamous relationships, and compersion appears to be a cherished benefit of this lifestyle. For these women, love is not a zero-sum game; it can be shared and enjoyed across multiple people in non-traditional formats.
It's great to be one of those women!