.HTACCESS files useful tips and tricks is a nice tutorial that is, well, full of tips and tricks! Here are a few areas that the author, Garnet R. Chaney covers: Apache configuration, use of .HTACCESS files for web hosting users, .HTACCESS files format, custom error documents, enabling server-side includes, modifying the environment, adding new MIME types, restricting documents, authenticate restricted documents, protecting a single file, redirecting the client, rewriting the URL, and much, much more.
It’s hard to imagine a tip sheet on .HTACCESS files that is more comprehensive than this one is and I have bookmarked it in my Apache folder in Firefox.

