GlobalDictionary.com

They're looking up 'Yankspeak' for the Oxford English Dictionary
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Online English to Swahili to English Dictionary
Java-powered Swahili language word search.
www.freedict.com/

Online English to Swedish to English Dictionary
Java-powered online word search.
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Ultralingua Online Dictionary
Searchable dictionary of the English language, with standard, reverse and phonetic lookup. Also links to a range of other language resources.
www.ultralingua.net/

Online English to Portuguese to English Dictionary
Java-powered word translation search.
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Online English to Spanish to English Dictionary
Search for word translations between English and Spanish. Approximately 20,000 terms in each language.
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Online English to Russian to English Dictionary
Java-powered online word search.
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Online English to Hungarian to English Dictionary
Java-powered Online word search.
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Online English to Italian to English Dictionary
Translation search. Approximately 11,000 Italian terms, and 13,000 English terms.
www.freedict.com/

Die.net Online Dictionary
Cross-referenced definitions, spelling correction, and searches from WordNet, Webster's, and a variety of specialized sources. Supports regular expressions and the DICT protocol.
dict.die.net/