A clustering search engine (Google still doesn't have this!)

I must admit I am a steadfast Google user, fan, promoter. Yet I bumped across this site and although I don't think I will use it regularly I thought it had a neat feature that even Google should implement, barring any copyright infringments. The clustering of resluts into folders based on returned content is pretty helpful. In the case of "Ubiquitin" it returned various segemented options. for example it catagorized it as "Medical", "Antibodies", "Cycle and Ubiquitine", "Human", "Proteasome", "Cell Biology", and a multitude of others. Give it a whirl for yourself. I may crawl back to it when I am totally clueless about what i am searching for and it does not pop up under Googles define or perhaps Googles Suggest has nothing for me. I think that it can serve as a oerfect tool for the student. For example, if they needed to write a paper on the "Marburg Virus" all I had to do was type in the name and I would immediately get various catagories to choose each of my papers paragraphs to cover. It is seamless because for each idea you have a perfect set of papers, websites, and resources to choose from in that catagory. I also tested it on "Gun Cntrol" it gave me ten perfect catagories. I also can click on each one and get a whole new internal set to write evidence for within the paragraphs main idea.
well enough, go try it out yourself. let me know what you think.