I recently got pointed to google's 'more search tools'. I have found that they have given students greater depth to their research and their writing is becoming more focussed and specific. It has also given me more variety in what students submit when they do a piece of extended writing as by them using google search tools with variation they get pointed to different websites depending on their views (evaluation) of the information. As a direct result in class discussion has greater variety and depth to it and so more students seem to hold their hands up and volunteer what they have researched. Have a go with your classes and see if it has the same impacts.