I have a ton of images being hotlinked from my site. Is it possible to set up a redirect in apache that redirects requests for these images to my main site?
RewriteEngine On RewriteCond %{HTTP_REFERER} !^$ RewriteCond %{HTTP_REFERER} !^http://www\.example\.com/ [NC] RewriteRule \.(jpg|gif|png)$ http://www.example.com/this-site-stole-this-image.gif [L] Code (markup): Should get you going.
If they hotlink an image on your site then the visitor will see this-site-stole-this-image.gif, you could host that on some free image hosting site if you want to get rid of the bandwidth.