Yahoo has added a new search tool to What’s Next called Yahoo! Mindset. As in, “what was your mindset when you performed a search?”. It allows you to dynamically filter the top 100 search results according to a scale of commercial to non-commercial sites.
From the Yahoo Search Blog:
“Mindset uses an intuitive slider in the interface, so you can set the bias for commercial vs. non-commercial results.”
This is particularly interesting from a search engine optimization perspective to see what kinds of sites Yahoo considers “commercial” or “non-commercial”.