Your problem is that the ko-switch plugin is not loaded into your script.
The manji solution may not work in some browser (for example, IE11) due to the forced use of the mime type: github does not return the js source file with the mime javascript type, which IE refuses to run with error SEC7112.
Here is a fiddle that works. Instead, I refer to the plugin on rawgithub.com (don't notice that there is no point in raw.github.com):
<script src="http://rawgithub.com/mbest/knockout-switch-case/master/knockout-switchcase.min.js"></script> <span data-bind='text:type'></span> <div> Im a boolean! <span> Im an other!</span> </div>
http://jsfiddle.net/a5H92/1/
Tip. To find the error, I only had to look at the console of my browser.
EDIT : sorry I inserted the wrong code, but the violin was right;)
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