I received an email the other day from Jeff Kang, the person who created Queryster. This search engine tool allows you to enter in a query and then click on the search engine that you want to request results back from. It then takes you to that search engine results page. The ability to jump to an other search engine is at the top right corner of each page.
It is a nifty and fun tool.
Check it out at http://www.queryster.com/.