Search3 allows you to search Google, Yahoo, Live, Twitter and eBay and display any three as columns of results for comparison. In essense searching search.
Search3 is all about trying to make it easier to find what you are looking for. This means adding tools to accelerate your search, for example adding previews of every result just by mousing over the site.
Search3 allows you to search for a product, get the official webpage of the company, get the wisdom of crowds about that product via twitter and then get the best price for the product on eBay all in one place.