You can block hotlinkers with cookies and htaccess for literally any kind of file. Yes, people with java and/or cookies will be SOL but the way I look at it these people are likely not to be ones that would purchase anything from your sponsor(s) either.
The only other way I can think of would be to use PHP sessions to control access, but if you're building galleries or freesites that's going to likely cause you headaches with LL/TGP owners.
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