Mormon polygamists?

Last night I watched the first few episodes of HBO’s Big Love on DVD. Since I’m Jewish and wouldn’t want anyone who had never met a Jew judgding me based on having watched Fiddler on the Roof or Yentl, I feel like I probably shouldn’t use the TV show to draw any substantial conclusions about Mormon polygamist families. Then again, I live in San Francisco and don’t know any Mormons who I can ask. So, for those of you out there who are LDS or have LDS friends, how realistic is this series? Are there modern (non-compound-risiding) Mormons who are practicing polygamy? Does it resemble the way the family on Big Love is set up – separate houses, etc? Anything else you can dish or explain? I’m fascinated.