I found this search tool completely by accident last week. Middlespot is geared to researchers and functions in a way that is very different from Google. First, it organizes my past searches so that I can see them listed out every time I go to website. Then, it shows the search results two ways, as a list on the left and screen grabs on the right.
But perhaps my favorite feature is the Workpad. It saves the links from my search that I select, allows me to add additional links that I already know, and make comments on what I place in the workpad. That way, I can note what it was that I liked about the link. I find when I typically bookmark items, I sometimes forget why I thought I wanted to go back to them. The notes really help me track what I liked.
Check it out and let me know if you convert from Google!