Chinese Hotlinking?

[Buncha]

Here's the problem. I've got dozens of Chinese forums hotlinking some of my fullsize pics. The traffic these sites generate is astounding. It puts sites like The Hun and Worldsex to shame.

Blocking them with htaccess by domain doesn't seem to do much good. A new one pops up every other day with some random domain like 661pp.com or 2kkkk.com.

I can't disable all hotlinking. There are some sites that legit hotlink my stuff (like gallery preview thumbs). And I don't mind when most English forums hotlink, hoping that some surfers will follow it back to the source (and their traffic isn't overwhelming). I do have the fusker and lewww sites blocked. But those Chinese forums are draining my bandwidth.

Anyone have some tips, suggestions or tutorials on how to prevent Chinese hotlinking?

Thanks for the help.

Dave