Alternate vote would be good in places like the USA and UK. A lot of left-wingers vote democrat/labour to stop the GOP/Conservatives getting in. AV means you can vote for your preferred candidate (such as one outside the main parties) but if not enough other people vote for them, your vote goes to your second choice, so you can still vote against people who you really don't want in government.
If more of us valued food and cheer and song above hoarded gold, it would be a merrier world. - J.R.R Tolkien
