I use a cooperating set of Mac apps: connect to the server using Cyberduck, browse to a file and double-click to open it in TextMate, edit the file and type command-s to save, peripheral glance to the corner of the screen where Growl puts up a notification that the transfer completed successfully, then type command-shift-r to tell TextMate to tell the currently open web browser to reload its front-most window to see if the change had the desired effect.

A number of Mac file transfer clients and text editors support this type of integration.