Sputtr.com is a new-ish "search homepage" where you can enter keywords and click on the icon of whatever source it is you want to search - be it Google, Amazon, eBay, IMDB, or a host of others. You can also customize the page by including the sites you search most.
On the one hand, it has a slick interface. On the other, its audience might only consist of those power-searchers for whom search toolbars like Firefox's are just not fast enough.
As Merrilee at the OCLC hangingtogether blog notes, library-related searches like WorldCat and LibraryThing aren't even options (yet).