In a previous semester I wished to get a large file (about 500MB) to about 500 students. UF's Sakai system doesn't support files that large, I had my reservations about using DropBox with that many students (e.g. keeping the file limited to only UF students), and using USB sticks was out of the question. It is a little late now, but it seems UF offers a secure file transfer service that can require a GatorLink login. Pretty neat. The service is called File-Express, and I will certainly be trying it in the future.