Especially for Translators

A Gold Mine!
http://www.les.aston.ac.uk/extdic.html
The must-have reference tool for language specialists, with essential links for translation in several languages, as well as links to dictionaries and educational sites. (This may be the only link you need!)

The Translator's Home Companion
http://www.rahul.net/lai/companion.html
An enormous amount of information of all kinds of interest to translators