John, I have other concerns:
What about webmasters using Microsoft's IIS web server?
About 30 % market share april 2009
Links:
Easiest way to get .htaccess like access control with IIS 6? | Ask Metafilter
HOW TO: Migrate .Htaccess Data in a UNIX-to-Windows Migration
Personally I combine robots.txt (disallow file types and folders) and .htaccess (deny access to a folder and sub folders).
This discussion started here (post #159)
New Canonical Tag from the big 3