Recommended links

http://translate.google.com/translate 
- Google Translate, the best translation service online.

http://www.thefreedictionary.com/
- The site claims to be: "The world's most comprehensive dictionary".

http://www.word2word.com/coursead.html
- Free online language courses, multiple languages.

http://www.wordreference.com/
- Various online language dictionaries

http://lexin.nada.kth.se/sve-eng.html 
- Lexin, a dictionairy specialised in Swedish.

http://dict.leo.org/ 
- A dictionairy specialised in German.

http://www.bbc.co.uk/languages/other/quickfix/
- A vocal dictionairy of key phrases in 36 languages.

http://www.linguagum.com
- English excercises, get daily English exercises  in your inbox.