One interesting fact I picked up while in Ireland was that the Irish use IRV in their elections for President and Dail (parliament). This site describes the process for casting a vote for president.

The elector votes in secret in a voting compartment. The voter indicates the order of his/her choice by writing 1 opposite the name of his/her first choice and, if he/she so wishes, 2 opposite the name of his/her second choice, 3 opposite the name of his/her third choice and so on. In this way the voter instructs the returning officer to transfer the vote to the second choice candidate if the first choice is eliminated. If the same situation applies to the second choice, the vote may be transferred to the third choice and so on.

Of course, the Irish still complain about their government, but then I think they’re all anarchists at heart!