English Club
English Club: Proverbs
EnglishClub provides a definition for the term "proverb" on this reference page. Numerous example of proverbs are provided.
Other
The Phrase Finder: Meanings and Origins of Phrases
The free section of this site provides the meanings and origins of thousands of quotations, euphemisms, popular fallacies and misheard song lyrics. A British site, some of the expressions are not familiar to most Americans.
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Proverbia
This is a collection of thousands of quotations and proverbs by famous authors. You can search by subject or author. Available in Spanish and English (content differs for each language).
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Bob's Byway: Glossary of Poetic Terms
Calling itself "unique," Bob's is easy to use, with cross-links throughout, phonetic pronunciation guides when necessary, and many examples and quotations. Click on the letter and scroll for the word.