We have recently introduced a new tool called Slide Path in our teaching. This allows us to upload high definition microscope slides onto a web server from where they can be examined using a special viewer. It really is quite fascinating to be able to zoom in up to 40x on an image of a mouse embryo, scan the image and adjust the contrast.
The tool is quite powerful as it allows you to add annotations and even assessments. In addition images can have restricted permissions or shared with colleagues in other institutions.
Have a look at a few examples by following this link.