Wow, that's wonderful, I just tried it, works great! (BTW, usually "Ctrl-x f" brings the find file prompt, and don't forget the starting "/"). It uses ftp underneath, so make sure the other system is running ftp.
Comment on Re^4: Cross-platform development: editors
There is something called tramp which allows
you to use ssh instead of ftp.
I've had problems sometimes though when copying+pasting
large chunks of text from one remote machine to another, though; it seems to leave off some of the text...