encrypted file transfer protocols compared

I like putting up some explanatory "this versus that" documents on stuff I know a little about. I've done things like curl vs wget, ftp vs http and http vs bittorrent in the past.

This time, I decided it was about time to do a technical comparison of the four major encrypted file transfer protocols SCP, SFTP, FTPS and HTTPS and explain how they differ in as many aspects and viewpoints as possible. I quite often get questions about how some of these compare against some of the others and why you'd use one instead of another etc. I hope this document will help people to find such answers themselves.

Of course I do mistakes and sometimes express myself in muddy ways, so your feedback and help is important. You can help me make this comparison become better!

http://daniel.haxx.se/docs/encrypted-transfer-protocols-compared.html

It's still rough and all, but what question and comparisons between them do you miss? What mistakes have I done? What parts aren't spelled out clear enough?