Zuula Meta Search
http://www.zuula.com/

Zuula provides the results from your favorite search engine unaltered, so you can check those first and then get results from other search engines simply by clicking on their tabs. If you want to switch back and forth between search engines, Zuula remembers where you were. And Zuula keeps sponsored links (which are paid advertisements) clearly separated from the regular search results. Zuula is very customizable and easy to use. For each search type, you can set your preferences for which search engines are included and in what order. The search engine tabs can also be rearranged right from the search results page by dragging and dropping them. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.