HuskyPup - 6:25 pm on Mar 4, 2012 (gmt 0)
Welcome to my ex-hell hole of a couple of years ago! At one time I was getting more than 10,000 impressions every day just for ONE image alone, yes, every day.
Do you have a .htaccess file?
If so I have code which will stop hotlinkers but also allow Google, Yahoo and Bing access to spider your site.
If you have a CPanel be very careful if you use hotlink protection, yes it worked however it blocked everything insofar as I was concerned. I had to experiment a lot until I got it right. It probably took me about 3-4 months but worked immediately on all the thieves.