Sometimes I forget the wonders of the different modules Apache has. A friend of mine drew my attention to mod_rewrite. A very useful tool indeed. You can prevent people from steeling your content, or do other nice redirecting rules with it. Here is a nice example that illustrates how to redirect all incoming calls from one site to another (just put the lines in your .htaccess file):
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{HTTP_REFERER} ( [NC]
RewriteRule myarticle.html [R,L,NC]