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Im a sucker for dictionaries. In addition to Apples default, I have ODE, SOED, and WordWeb Pro. Although the Oxford dictionaries are particularly useful for more obscure words and for providing additional information, I find WordWeb Pro often has the most useful definition, plus an abundance of other information: synonyms, antonyms, similar words, less specific words, and more specific words. My only complaint, which I make more tongue-in-cheek, is that I can never remember the symbols associated with each.
A very useful resource. I love the fact that all of my purchased dictionaries are consolidated into one tool: I find it worthwhile to compare definitions across each of the integrated dictionaries.
TheKemer about WordWeb Pro Dictionary