About.com Save
All in one search page allows you to search various quotation search engines.
http://quotations.about.com/?once=true&   

Bibliomania Save
Hundreds of searchable full-text works of writing.
http://www.bibliomania.com/   

Quotations at Bartleby.com Save
Search 86,000 quotes for all occasions.
http://www.bartleby.com/quotations/   

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