Google Weather API shuts down?

Anyone using the Google Weather API would have noticed some strange behaviour early last week. Namely some 403 errors - then lastly the response code became 'Unsupported API'
Here is an example:

http://www.google.com/ig/api?hl=de&weather=london

Now one should start using different api's to grab required weather data in widgets or other programs. Some I have had a play around with are:

http://www.wunderground.com/weather/api/
http://www.worldweatheronline.com

The Yahoo weather api is another, but it uses the Where On Earth ID (WOEID), which requires an additional call to find the WOEID of the location, so not so good for my projects. http://developer.yahoo.com/weather/