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.
Other
Kryss Tal: The English Language: Words Borrowed
An incredible comprehensive list of "borrowed words" in the English language, grouped by the languages from which the words are borrowed. Provides and describes dozens of languages and literally thousands of loan words. Highly recommended.
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.
University of Manchester
Children's University of Manchester: Word Literacy: Borrowing Game
This collection offers three games through which students match English words to the language from which they were borrowed.
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.