Free Translation Online
A very nice, easy-to-use online translation program that covers 91 languages (English, Spanish, French, German, Russian and Portuguese)! It is one of the better interfaces around. Extensions for the main browsers are available.

Dictionary.com
A simple, uncluttered online translation program. Not fancy, but it covers quite a few languages, including Japanese, Chinese. Korean, Dutch, Greek, Italian, etc. A good place to start.

WorldLingo e-mail translations
Machine translation is a cost-effective alternative to professional translation. Translate websites, documents, emails, and text into as many as 15 languages instantly.

Promt
Promt is another online service that you can use to translate text, web pages and e-mails. It only covers seven languages though (English, French, Spanish, German, Russian, Portuguese and Italian). There are also software products for sale. Registration is available – for free – to access more advanced features. Worth a try!

Word2Word
Word2Word’s list of online translators – A nice collection of online translators out of the mainstream. If you’re looking for a way-out language, this list may cover it.

TravLang
Like the name says, this service is aimed more at the traveller, but offers similar services to all the other online translators.