I am all about collaboration and sharing of files when it comes to student projects or teachers working together. Normally, groups can share documents with Google Docs, Dropbox, or a Wiki. Dropcanvas helps groups share multiple files by creating a canvas that you can quickly create, add files to, and then share by email, social media or embedding it. It was very easy to sign up (you actually don't even need to register) and easy to use.
I like dropcanvas because you can share multiple files in one place quickly. Pretty cool. Give it a try with your next collaborative project.