Well, I don't have many things in my favorites. www.dictionary.com is a reference I use all the time, though. Google, Wikipedia, Dictionary/Thesaurus, Erowid, etc.

I'm great at spelling too. In fact, my mother, with her huge vocabulary, is always coming to me for spelling help. Dictionary.com is for those words I've never used before, or words I hear that I'm not sure of the meaning of. It never hurts to increase your vocabulary.