This is the best Google Application I have seen in a long time - mind you I do teach Art. Google Art Project is a attempt to bring all the major world art galleries to you. For a teacher this makes the idea of a virtual excursion so easy. Now all we need is a central place to contribute worksheets, digital tasks and interactive activities.
Your students can now complete a virtual tour of about 20 major galleries, more to be added as they come online. I love this. Have a look at the explanation.
This opens the door to so many educational opportunities - art galleries, science museums, natural history museums, the list is endless. Congratulations to google on the starting this project.