Translate.Net is free client to many translating services available online (translators, monolingual and bilingual dictionaries).

For more info please use http://translateclient.googlepages.com/

Already supported 20 sites, 31 services, 37 languages, 1352 translations directions, including Google translator and dictionary, Wikipedia and Wiktionary, Yahoo Babel Fish Translator, SYSTRAN translator, Merriam-Webster dictionary and thesaurus. You can check full list of supported services and languages at http://translateclient.googlepages.com/services.en.html