greenleaves - 6:48 pm on Mar 28, 2012 (gmt 0)

Ditto what Bill said.

I take it a step further. Long before pinterest I set up a anti-hot linking script which replaces the image with one that reads something like:

Get Cheap Widgets at MySite.com (for drop ship site)

Or:

Warning, BEFORE you Buy Widget, Visit MySite.com (for affiliate review site)

Also, you could watermark them so you get free exposure in exchange for a little bandwidth