Rice University
Rice University: Loan Words
An exhaustive and comprehensive resource on the definition, process, and uses of "loan words" in English. Includes several examples of words grouped by subject and language of origin. Excellent site.
Monmouth College
Monmouth College: English Loan Words in Other Languages
A list of words in English which have been borrowed from other languages. Includes the languages of Italian, French, German, and Japanese.
Other
Yellowbridge.com: Chinese Loan Words in the English Language
An interesting language resource which details some of the few "loan words" in English from the Chinese language. Provides information and a list of Chinese words and characters.