Just realized that you've completely overlooked this most excellent portable app. I've been using it daily, on my USB drive, ever since I've owned it -- and well before I discovered PFF/FFP. Works great! It even allows you to run PuTTY in a window!
- WinSCP is an open source freeware SFTP client for Windows using SSH. Legacy SCP protocol is also supported. Its main function is safe copying of files between a local and a remote computer.
Download it here:
I use the "Standalone application" -- Norton Commander style...
To make it TOTALLY portable:
Oh, BTW, wink, wink, nudge, nudge...
Learn how to distribute pre-configured version of WinSCP: