First, though, I guess I should post a wee introduction. I'm Baf, girlfriend of the original Polyblogger herself. :) She's graciously allowed me access to post here, so I'll be inflicting my thoughts on you from time to time as the mood strikes me. :)
It strikes me today, because I've just finished reading Dan Savage's book Skipping Towards Gomorrah. It was a very entertaining read, btw--he sets out to commit all of the Seven Deadly Sins and to show people that really, these things we think are so awful, well, aren't. The book has a rather pointed anti-conservative bias (well, you know...Dan Savage and all...), but if that sort of thing either doesn't bother you or is something you can get past, it's a fascinating look into some of our American subcultures.
The "Lust" chapter is about swinging. I liked the positive portrayal of swinging that he gave. I didn't like so much that he sort of assumed that swinging was the only non-monogamous alternative there was for a committed relationship. He omitted any mention whatsoever of polyamory. Maybe because polyamory doesn't seem as much like "adultery" as swinging does? I don't know. I felt the chapter might have benefited from it. His point throughout the book (well, with one notable exception, but I don't want to spoil it for you) seems to be that all these things that give people pleasure are illegal or immoral and shouldn't be. He makes a great point--he doesn't presume to tell arch-conservatives what to do in their bedrooms, so why do they feel the need to dictate what he should do in his?
FWIW, I definitely think swinging and polyamory are both perfectly valid, but completely different, lifestyles. I'm all about whatever makes people feel good. :) I don't quite "get" swinging, because I don't get the idea of sleeping with someone that I don't have some sort of an emotional connection to (even if that emotional connection is just "friend"), but I don't have a problem with people being involved in that lifestyle, either.
I just wish sometimes that people wouldn't paint all "non-monogamists" with the same brush--I've heard What We Do labelled as both "polygamy" and "swinging" at times, and I don't know about you, but what I do is neither of those.