Learning English with www.leo.org

leo.org is a german-english, french, spanish, italian, chinese and russian dictionary which I often use.
This dictionary also has language forums and a vocabulary trainer.
If you are looking for a word, it has more results so you can find the best one. In addition you can listen to the words if you don't know how to pronounce it.
I find it very helpful because I can see different ways to say one word and  it is very easy to use.