I am a long time customer of Amazon.co.uk as they deliver books to Norway quicker than their Norwegian counterparts for some reason, and a lot cheaper 
However, they also have a wide reach of nifty web services, some which I have added to this site, and their text clouds called product clouds is a really interesting piece of technology.
Introduced as a general widget for webpages described here, the widget looks over the site and adapts the text cloud with products relevant to the site and page currently showing. As text clouds are based on a statistical mapping of a page, this offers a different result than say Google AdSense.
If you look at the sidebar of my blog, you can see the product cloud in action, I particularly love the hover effects popping up a small information window.
There are also other interesting Amazon services, and I will be writing about those in the weeks that come.
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