Unfortunately encryption in general (files, emails, data streams, or otherwise) is often feared and misunderstood, because it can be quite complicated. It requires that the user have a fairly detailed understanding of the transport process first, and then they have to learn about how encryption is applied to that transport process. When you throw in keys that are split in to public/private parts, numerous different algorithms, hashing, passphrases, and blah blah blah... a lot of people just shut down and ignore it.
On a related note... right now I am actually working on setting up a jabber server for
OTR communications. I have it working in my test environment, but still have a bunch of work to do, like disabling all logging, disallowing plain text, user management, and easier authentication.
s.