Titanfiles is a system which provides not only networked storage which is available on-line from anywhere, but it also allows you to control with whom you want to share either a single document or a whole directory. It also turns out that it's not a bad little video server.
Digital video files have many useful purposes in education. You can provide a more personal message to on-line students or demonstrate a procedure that students are sure to have to review when they actually have to do it weeks after it was demonstrated in lecture. It's also been common practice to record students giving presentations or sample lessons to give them feedback and critique on their performance.
One big problem is video files are HUUUUGE! The quality of file you see on YouTube can be a megabyte a minute, and DVD quality about 7MB a minute. Exchanging these things via email can create problems. The limit on attachment size with Titanmail is 10MB. I guess you could fit some video under that limit, but if you were sending that file to multiple people, you could put some serious strain on the email system.
Instead, you could put the file in your Titanfiles account. You've got a gigabyte available. Then create a ticket, which is just a specially encoded URL, and send that to whomever you wanted to watch the file.