Beyond Google!
Use ~ before your keyword to get synonyms
Use Define: and your keyword to get definitions and related keywords on the web
Ask - narrow and expand search
Clusty - cluster results
Clusty Cloud - create keyword cloud and html code
Exalead - narrow and preview results
Grokker - outline or map view
Kartoo - visual meta search engine
Kids Quintura - visual search results
Powerset - search wikipedia
Quintura - visual search results
Rolloyo - create your own searchroll
Viewzi - change your search view