IQuite
This application has a wealth of quotations and is its greatest asset. However, two limitations diminish its value: (1) the authors are searched by their FIRST name (most users would know last names, but may not know authors first names), and (2) there is no ability to search the text of the quotes to find the author of a quote you have heard. The navigation could also be improved to diminish the flicking necessary to traverse long lists. Otherwise, IQuote is a good application and well worth the price.
OldTech about
IQuote 2.0 - World of Quotes