Tate Learning

http://www.tate.org.uk/learning/
The Tate Learning website is a great resource for teachers and students, both those who can make it to one of the Tate's galleries in the UK and those that can't. There's plenty of information, activity ideas and games included on the site. I've just been having a go at the Memento Mori games and the Case of the Mysterious Object (which is great if you're looking at sculpture in art).