pixar24 - 9:24 pm on Jan 29, 2013 (gmt 0)
To stop the image hotlinking:
Cloudflare offers a free CDN service, with the option to disable hotlinking.
I enabled the hotlink feature, and Bing + Google can't show the images in full size anymore.
Visitors get an error message from Cloudflare: "The owner of this website (www.xxxx.net) does not allow hotlinking to that resource (/xxxx.jpg)."
Don't know if this will remove the images from the Google/Bing index in time, but it's a first step.