Dropmark is a service offering a simple platform for private and public file sharing. Dropmark is similar to DropCanvas that I reviewed on Tuesday but it offers some features that DropCanvas does not offer.
To use Dropmark you do have to create an account. Once you have your account established you can simply drag files from your desktop onto a blank collection screen in your account. Once your files are in a collection you can make that collection public and share the url assigned to it. Alternatively, you can keep your collection private and share it only with people you invite. Within your Dropmark account you can create multiple collections.
The video below provides a visual overview of Dropmark.
Applications for Education
Dropmark could be a good tool for organizing materials associated with each of your lesson plans or units. I might use Dropmark to assemble all of the primary resource files and lesson outlines that I have for my Revolutionary War unit and share them with my students so that they can access them all in one place too.