Google expands its Search Options to let users search results by past hour, specific date range, more shopping sites, fewer shopping sites, visited pages, not yet visited, books, blogs and news. The new search options, rolling out gradually in English on Oct. 1, can be accessed when a user does a search and clicks the blue bar under the Google logo.
Earlier in May 2009 Google released search options that enables users to search and see Google results through more specific parameters. Read it from the horse's mouth:
As search engine race continues these additions surely help Google to keep pace with.