I often had to share passwords to services with students so they could work on a project. We all had shared access to a Google Docs area and a wiki, both passw

I often had to share passwords to services with students so they could work on a project. We all had shared access to a Google Docs area and a wiki, both password protected. So once a student was allowed access to either of these protected spaces I could use them to transfer a password. I'd type the password in some random document, tell the student to go look at that document, they'd email that they had the password and I'd remove it from the document. Getting the students access to the Google Docs or wiki was a simple process, they could request access to the Docs and my boss would vet and grant it, or a sys admin would add access to the wiki for them. So once you establish one relatively secure channel, you can leverage it for other secure purposes. Probably not highly secure, but we weren't protecting nuclear secrets.