For the last three decades, search engines have been presenting results in descending order. While a lot of innovations have happened with the sorting algorithm

For the last three decades, search engines have been presenting results in descending order. While a lot of innovations have happened with the sorting algorithm, it hasn't fundamentally move forward from that. From a user point of view, it's frustrating to look through the result, finding a list of ads, a commercial site, a few videos, a definition, a wikipedia link, a commercial site, and so on. Instead, users have a pretty good idea of what kind of result they want. It would make it so much easier if the results are grouped together. For example, a search engine could group results under individual tabs, separating results from user generated content sites, forums, commerce and commercial blogs, Wikipedia, content farms, and so on. Within each tab, there could be subtabs grouping results under each domain. This would make searching the web a much less frustrating experience.