today released a new free tool to help teachers create a web 2.0 activity for their students. The tool allows users to upload images and then label parts of the image. After labels have been added to the image, students can test how well they know where the labels belong. The studystack site will display the image with each label replaced with a target. The site will then ask the user to click a specific target. The site displays how many targets were clicked correctly and how much time it has taken.