Google Websites

a.Google Suggest for using google very efficiently
url:

http://www.google.com/webhp?complete=1&hl=en

b.Google Code Search
url:

http://www.google.com/codesearch

c.Developer Home
url:

http://code.google.com/

d.Google Book Search
url:

http://books.google.com

e.Web History
url:

http://www.google.com/history