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robots.txt - you can instruct them on what you permit them to do (including their image bot).
meta tags to manage cach/no-cache
.htaccess is good to manage hotlinking
you can also request them to purge their cache.
You should balance all the above are steps with any potential positive impact.
I know I get lots of valid surfers from Yahoo's thumbnail searches - they actually copy my content and create their own thumbnails. They do come to my site and sign up.
With G's recent fiasco 'algo change', I'm inclined to 'moon them' with any images they try to hotlink using .htaccess
-Dino
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