It had to happen really. Less than a week after finding one Google Maps based surveying tool (SurveyMapper) I quickly stumble upen another.
Ask500People lets you easily set up on an online poll. Each poll created on the site gets its own Google Map so you can see the location of where people have voted. The map markers are colour-coded so you can tell at a glance which way people have voted around the world.
SurveyMapper is a more advanced real-time geographic survey and polling tool, with more options for serious data analysis of a poll's results. Ask500People is aimed more at quick fun polls rather than serious surveys but it does have some serious features, such as the option of embedding a poll and it does come with a serious API.