For anyone has been involved in international SEO the issue of cross domain duplicate content is quite a big one. Well now Google have introduced a new alert in Google Webmaster tools to alert you when they don’t show a URL because it has been duplicated elsewhere. At the moment a webmaster can resolve some of these issues using a cross domain canonical-tag or by simply 301 redirecting a page. But you may never know about half the traffic being lost due to this issue. The main causes Google give for a cross-domain URL selection (when they choose another URL over yours) are:
One of the more interesting subjects discussed this time last year was around Google’s evolution into the biggest affiliate online. Redfly wrote a really good post on the topic here. That post is worth a read (if you haven’t already) as it gives a great overview of how much Google’s business model continues to evolve.
Google have made another huge leap towards trusted brands, now showing multiple listings from a single domain. From the example given in the blog post, the domain amnh.org has 7 listings on the first page for “exhibitions at amnh”. If you count the customary Wikipedia listing, that leaves two spaces left for other sites. Another example can be seen if you search for “apple ipods”