This free app can be used to search famous quotations by author or by partial quote… just enter the text you want to search for in the relevant box and hit the button.
it searches a database table containing over 35,000 famous quotations and sayings, organised by author and genre.
There are some technical details on how this was set up here: Loading CSV data in to MySQL – random quotations app Part 1 and there’s a similar post on the PHP side of things in the pipeline.