Searchmash is the test bed for next generation google search. This site is owned and operated by Google, Inc. It is called Google Search 2.0. It’s look and feel and presentation are designed such a way that it is easy to explore the data we search. It is worth to test this site.
I have developed a search engine plug-in for Firefox, to search using this site. I have done nothing more than running a wizard provided by searchy. In this site, look for searchmash and download the plug-in. It will prompt you for adding the searchmash search engine plug-in. If you agree, immediately you can see searchmash search box in the drop down search engine list at the top right corner of the Firefox.