Please note that it will be many years before there is a truly accurate online instant language translation service. The automatic services advise that they are just a guide only so that you may get the 'gist' of the meaning of a passage. If you're wanting something properly translated, you need to hire a human translator.

Google Translate. As soon as this was launched it quickly took over as being the dominant language translation service on the net. Fast and free it can also be integrated into Gmail so one click on a foreign language email and your email is in English! There are over 50 languages available with more being added regularly.

AltaVista
Not only can you translate text from English to Chinese Simplified, French, German, Italian, Japanese, Portuguese, Korean, Spanish and back again, you can also type in a web site address and translate that too.

WorldLingo
World Lingo cover the same languages as AltaVista but they also cover Chinese Traditional, Dutch, Greek and Russian. An extra feature of World Lingo is the option to include a subject, making the resulting online foreign text translation a little bit more accurate.

Free Translation
Free Translation offer similar language translation services to AltaVista and World Lingo but they also translate Norwegian into English.

InterTran by Translation Experts
Our pick purely for the extra languages offered. As well as many of the ones above, Intertran allows you to translate text or websites from: Bulgarian, Croatian, Czech, Danish, Finnish, Greek, Hungarian, Icelandic, Filipino, Polish, Serbian, Slovenian, Swedish, Welsh, Turkish and Latin into English. There are also additional translation options offered, including alternative translations for some of the words where the meanings may not be clear. Worth a visit.

Langenberg
If you're not wanting to visit any particular site, or just wish to translate a few words, bookmark this page. The author has assembled all the translation boxes from the foreign translation competitors sites into one page. Also some dictionary translations available.
 

Electronic English language Voice Tutor system for Russian speakers  English and Russian speech recognition and voice input will give you over 1,000,000 words including American idioms, medical, technical, legal, and business terms, as well as common and colloquial expressions and interactive language learning system. The language course is designed as a two-level system with placement and progress tests and the full complex of grammatical, vocabulary, and phonetic exercises to help you master English. Special functions say, translate, or explain the foreign language material. Special text book included. Find out more here The Electronic English language tutor is available in other languages