At the Handheld Learning Festival I attended a session by Ollie Bray from Learning and Teaching Scotland, he went through a variety of websites that could be used to support teaching and learning. One of his suggestions was Bing, Microsofts new search engine, Ollie didn’t mention it for it search capabilities but for the picture on its homepage.
When you move your mouse over the picture on the homepage there are several notes/questions about the picture. As the picture changes daily this could be a nice activity at the start of a lesson.