Actually, if you follow the "original article" link at the bottom of the page, you do eventually get back to the wikipedia version of the article, even though ezresults is doing some kind of frame-redirect so that the URL doesn't seem to change.
More worrying than ezresults is WordIQ (www.wordiq.com) which not only swipes wikipedia content without link back, GFDL compliance, or even a mention of WP (see http://en2.wikipedia.org/wiki/Wikipedia:Sites_that_use_Wikipedia_for_content), but also each article still links to wikipedia servers for all the images, thus stealing bandwidth from WP.
I wonder if it would be (a) technically possible, and/or (b) a good idea, to prevent images from being served that are offsite linked from pages on either WordIQ in particular, or all non- *.wikipedia.org sites in general.
The second option might break many GFDL-complient copies of WP, though, depending on whether they have local copies of article images.
-- Bob [DrBob] Mellish.