boolToX custom binding

HTML

<script src="http://cloud.github.com/downloads/SteveSanderson/knockout/knockout-1.3.0beta.debug.js"></script>
Ethnicity (New)
<select name="Select1" data-bind="value: SelectedEthen">
<option value="yes">I am Hispanic/Latino</option>
<option value="no">I am not Hispanic/Latino</option>
</select>
<br/>
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<br/>

<span data-bind="text: SelectedEthen"></span>
<br/>

JavaScript

var viewModel = {
        SelectedEthen : ko.observable(""),
        ETHEN: ko.observable(""),
    };

ko.applyBindings(viewModel);