the MarkerManager is ready for use when it raises the 'loaded' event.
The "getProjection()" error is likely to happen when you use the
manager before it is 'loaded'.  Therefore a callback function is
required for loading markers into the manager:

mgr = new MarkerManager(map);
google.maps.event.addListener(mgr, 'loaded', function() {
  // load markers here
});

see the Weather Map example:
http://google-maps-utility-library-v3.googlecode.com/svn/tags/markermanager/1.0/docs/examples.html

...

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