A very nice online dictionary (with an iPhone version also). Will not only give the definition, but the part of speech (including transitive and reflexive forms of verbs on the same results page) and a conjugation table for verbs. Now many entries also include a video entry with proper pronunciation and an example sentence and translation.
Editor’s Note: the site also has a verb conjugator which isn’t bad (but I still prefer the 123TeachMe one) and, interestingly, a translator which allows you to enter text and it will show you the translations from three different engines (google, yahoo/babel fish and Free Translation).
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