RY楽訳中国語辞書

The Rakuyaku Chinese website has a lot of resources in Japanese for learning Chinese. Including their regular dictionary, they also have a "conversation" dictionary -- type in a common phrase in Japanese to get the Chinese equivalent. Also, for those working on their pronunciation, the main page has an application that lets you type in pinyin and hear how it should sound. There is also a section for searching the traditional equivalent of a simplified character, or even the Japanese kanji version. Very nifty!