http://dojotoolkit.org/documentation/tutorials/1.6/ajax/
http://dojotoolkit.org/documentation/tutorials/1.6/jsonp/
equivalent: http://search.twitter.com/search.json?q=sustainability (except with dojo defined callback)
doc: https://dev.twitter.com/docs/api/1/get/search

try: http://api.flickr.com/services/feeds/photos_public.gne?tags=sutainability&lang=en-us&format=json
similar: http://dojotoolkit.org/documentation/tutorials/1.6/recipes/app_controller/demo/demo.html