I can not tell you how bad image leeching is. If you do not know what I am talking about it is when you have an image on your web site and someone else embeds a direct like to your image on their site or something like E-Bay. There are two things wrong with this, first is copyright. The second is excessive bandwidth usage.
I was visiting www.iis.net today and saw this ASP.NET module to stop Image leeching on the new downloads page. I can not wait to try it out. I have a few customers that could really benefit from this. I have never gotten around to writing this module, but I think I will get to it now. There will always be modifications that need to be done to something like this!