DHD is crap. Here's another example of webmasters being cheated:
http://www.ddgtools.com/tools/vid_page_1.html?109359
It initially takes you to a page where the cookie is carried over for all links, but if you click on 'MORE VIDEOS', you get taken to a page, this one (
http://www.ddgtools.com/tools/vid_page_2.html), where the cookies are not carried over for any links that allow the surfer to join the site!