WebDAV is probably one of the least used utilities available to developers and content managers. Personally, I got familiar with WebDAV only thru Apple's Mac OS X. Anyway, it is far easier and more efficient to use compared to FTP. However, just like any other services on-line, security and authentication are critical. Here's how you can use SSL and two-factor authentication to secure WebDAV. The article summarizes:
Combining WebDAV and Apache provides a great deal of flexibility. With flexibility often comes insecurity. However, by locking down your server, encrypting data in transit with SSL and using two-factor authentication, you can create a system that offers maximum ease of use without sacrificing security.
Anything that deals with security is very important. So that makes this a MUST-DO. :)