Zooniverse is a "Citizen Science" project that started life as Galaxy Zoo. A researcher at Oxford University realised that humans are better at classifying galaxies from photographs than computers. They asked people to help via the Internet and were overwhelmed by how successful it was. They have undertaken many similar projects. They have just launched one to help researchers at the Large Hadron Collider at CERN identify particle events on photographs that might lead to more evidence for the Higgs Boson. I had a go yesterday. There are instructions to help you. Some of the pictures are easier than others but you should have a go and help this wonderful project:
http://www.higgshunters.org/