Yahoo Mindset is great.
Slowly but surely this obscure tool from Yahoo is becoming my favorite search engine. I don't know why Yahoo is not widely promoting this great feature upfront on their homepage. It is probably because Mindset is currently in beta.
Whenever I am searching for a product review or want to delve into in-depth research materials, I quickly fire up Mindset and move the search dial all the way to the right. The results I get are almost always relevant to the search string entered. The same search strings on regular search engines produce sites with something to sell or sites with ads plastered all over the page, which could be useful when you want to buy something. But, for research you need Yahoo Mindset.