Yesterday Google announced that they are renaming the "search history" section to "web history" because it is now a more fitting name. Google Search History Expands, Becomes Web History by Danny Sullivan is the ultimate and most detailed write up I have seen on this. Danny explains that the change in name is "to reflect how it has expanded to track what Google users do as the surf the web." Of course, this can mean some big privacy issues - so I would recommend reading Danny's article to understand more about the expanded features you can get in your "web history."
- View your web activity. You know that great web site you saw online and now can't find? With Web History, you can.
- Search the full text of pages you've visited. Web History allows you to search across the web pages, images, videos and news stories you've viewed.
- Get personalized search results and more. Web History helps deliver search results based on what you've searched for and which sites you've seen.
The forums just starting talking about and the early onset is confusion.
But some are thinking about the SEO implications:
I think the implications of this would become bigger for SEO as it becomes more popular. It adds another criteria for the SERPs and its something that is hard to control depending on the algorithms used to determine the results given due to personalisation.