This one irks me. I can understand that religious people want to portray themselves as servants rather than masters, but remember that "webmaster" means "master of the web site." Changing "master" to "servant" in this case doesn't get you any spiritual brownie points.
I guess it strikes me as false humility (besides being misguided). I have the same reaction when I hear of a student group's leadership team renaming itself to be called a "servant team" instead. There's no shame in being leaders (see 1 Tim 3:1). Yes, Christianity is not about lording your authority over others, but there's a difference between saying "do this because I'm in charge" and being recognized as a leader in a particular organization or field.
If you're called/appointed into a position of authority over a given organization, ministry, or area, don't be ashamed of calling yourself a leader. And the lead -- and serve -- according to the charge given to you.