Has anyone successfully deployed the Weather Zimlet?

I've deployed it. I've added *.api.wunderground.com to the zimbraProxyAllowedDomains attribute for all the COS.

When I go to use it in the WebUI though I get the REST API error.

I'm wondering if maybe the Wunderground API Key that's in the .js file is either invalid.....or doesn't allow more than X number of uses during a day....or something. Should each site generate it's own API key or should the default one work? There was a passing mention of the API key in the YouTube demo of the Zimlet....but not much detail.