thank you for this great hack , i'm cashing all .css files through htaccess , and it duplicates the speed i wonder if anyone wants it , could add below lines to htaccess , it forces users browsers to cache these certain type of files to be stored in the user's computer and called from there for next visits !
Code:
# cache images/pdf docs for 10 days
<FilesMatch "\.(ico|pdf|jpg|jpeg|png|gif|swf|js|css)$">
Header set Cache-Control "max-age=864000, public, must-revalidate"
Header unset Last-Modified
</FilesMatch>