Dictionaries I use:
Both are extremely useful! The first one is more of an encyclopedia. The second one is sure to help you out when it comes to slang.
Share your thoughts and tell us what dictionaries you use :)
I think google.com is the best dictionary/thesaurus there is. ))
Just type there what you are looking for and there you go.
But the ones that you use are very helpful indeed. I myself often apply for them.