I just re-watch a 7 minute video on Usury. If you don't know what it is, then I would recommend you watch it. Prabhu Guptara gives a very good and easy to understand explanation of usury. It might change the way you loan money. Prabhu's blog is very good too, I have a link to it here on my blog.

Here's the link to the video called Conflicts of Interest. It's on a site called Big Picture TV which also has a lot of other interessing videos.