I have gotten a little farther but still haven't quite fixed it.

It was suggested that I use ScriptInjector because HTMLPanel inserts
using innerHTML and that doesn't update correctly in IE.

We're not on 2.4 yet but just to try I copied in the source files
needed for ScriptInjector and attempted to use that. The JS files
download correctly in both browsers, but I get the '$wnd.xxxx is
undefined exception' indicating that the references in the external
script can't be found. I don't try to load my widget until the
onSuccess call returns from the script inject - so my code looks
something like this:

ScriptInjector.fromUrl("http://example.com/foo.js";).setCallback(
      new Callback<Void, Exception>() {
         public void onFailure(Exception reason) {
           Window.alert("Script load failed.");
         }
         public void onSuccess(Void result) {
           Window.alert("Script load success.");
           MyWidget widget = new MyWidget();
           client.onSuccess(widget); // adds the widget to the view
         }
      }).inject();

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