Yesterday's Mashup of the Day was a fun one for those who miss the good old days of command shells, goosh.org, "the unofficial google shell". Developer Stefan Grothkopp coded this on top of the Google Ajax Search API to give you a command shell for interacting with Google search queries.
Life on the web is full of search terms and human filtering. Even good results often require some effort to determine which has the information we seek. There are several services attempting to help with this problem and they're making their applications available via API.