So I use this basic solution, note that I update drupal using cvs method so I hide also the CVS directories. Put this code in your .htaccess file after RewriteEngine on inside the IfModule mod_rewrite.c section:

RewriteRule ^(.*)CHANGELOG\.txt$ http://www.perdomani.net [R,L]
RewriteRule ^(.*)INSTALL\.mysql\.txt$ http://www.perdomani.net [R,L]
RewriteRule ^(.*)INSTALL\.txt$ http://www.perdomani.net [R,L]
RewriteRule ^(.*)MAINTAINERS\.txt$ http://www.perdomani.net [R,L]
RewriteRule ^(.*)CVS$ http://www.perdomani.net [R,L]
RewriteRule ^(.*)CVS/$ http://www.perdomani.net [R,L]
RewriteRule ^(.*)INSTALL\.pgsql\.txt$ http://www.perdomani.net [R,L]
RewriteRule ^(.*)LICENSE\.txt$ http://www.perdomani.net [R,L]
RewriteRule ^(.*)UPGRADE\.txt$ http://www.perdomani.net [R,L]

Modify to fix your needs and save the .htaccess file.

F.A.Q.

1 – Why you use tons of rules for every file and not something like ^(.*)\.txt$ ?

Mhh, I really don’t remember, maybe I have some text file I want to be accessible in the site.

2 – Why not just removing that text files?

I think that CVS import them on every update, so you have to remove the files many times.