Using WebDAV to edit your theme
From Spiffy Stores Knowledge Base
You can now edit your theme using WebDav! See below for tutorials on how to use specific programs.
General settings
Access your theme files at https://yourstoreaddress.spiffystores.com/dav/
Username: Your store login email
Password: Your password
Setting up your computer to access your store through WebDav
About WebDav
WebDAV (World Wide Web Distributed Authoring and Versioning) is a standard for collaborative authoring on the Web. It is a set of extensions to the Hypertext Transfer Protocol (HTTP) that allows for collaborative editing and file management between users via the Internet.
For more information, check the WebDAV website at http://www.webdav.org