STV = Single Transferrable Vote. We use this system to elect members of the Representative Assembly (RA). Took me a while to understand it.
Here's the thread begun by Jon Seattle http://forums.slcds.info/viewtopic.php?t=4801#p25417
Here's wiki: http://en.wikipedia.org/wiki/Single_transferable_vote
Here's a helpful YouTube:
One take-away for me: give your votes only to the people you would like to see in office.