My post being the last on the previous page, I'm not sure how many people read it. I want to re-emphasize that the type of polygamy being referred to in this thread seems to consistently be the negative religion associated kind. While I suppose that I am focusing on polyamory more than polygamy, I feel many people judge polyamory as the same, so I feel it is right for me to discuss it here.
I am not denying that what other people have said about polygamy is potentially true (and may well be in certain existing circumstances). I just want to point out that this is not the only way things can work out. Newspapers/sites/shows love to broadcast bad news; a story of a man with 30 wives forcing children to marry him is going to get much more attention than a story of how a poly family is happily living together. I imagine it is much the same as years ago when homosexuality was much less accepted. They were painted as immoral freaks who had sex with everyone they could and spread AIDS rampantly. While to be sure, this held true for a certain subculture of homosexuals, presumably there were also perfectly normal, upstanding gay couples who just floated under the radar (either for fear of discovery or because people weren't interested in looking at the good aspects). I worry that polyamory has gotten much the same sort of bad press.
Again, I don't deny there are bad aspects of polyamory. And I DO NOT support misogyny, child abuse/abandonment, or any of the other ill effects that can be born from polygamy. But I would like to show people who are zeroing in on those specific cases that there are in fact other types of polyamory. They aren't as well publicized, but they are out there and they work.
This site has many interesting articles regarding polyamory (what it is and isn't, etc.).
This blog seems to have a poly perspective and also links to more information. Admittedly I haven't read much of either of these sites. I encourage you to find other resources. Use google scholar to look up polyamory or non-monogamous relationships. I'm happy to answer questions as well, though I don't have that much knowledge and only limited experience in polyamorous relationship.
EDIT: @iDunno, polygamy as it is practiced now may mainly have many wives to one husband, but by definition it does not have to be that way. Looking at healthy polyamorous relationships, you can see often the women have multiple partners. As I mentioned before, this has been true even in just my personal experience.
EDIT2: There are books with entired chapters dedicated to how to properly deal with children in polyamorous relationships. So people who care enough to practice this responsibly actually do try to think through the repercussions of their actions for themselves and their dependents.