Use .htaccess to disable hotlinking. Yesterday club1069.topfong.com, topfong.com, tt1069.com, and some other similar sites hotlinked a load of images from some of my galleries.

Luckily, I had bandwidth throttling enabled for the domain they hotlinked, so once the transfer reached a certain point the domain was automatically taken down and I was e-mailed by my host.

If I hadn't caught this, it looks like I'd be facing a minimum of $250 in overage charges.