BitEx日中・中日辞典
BitEx has a lot of online resources for Japanese speakers seeking to learn simplified Chinese, including an online dictionary. It also has a Chinese phrase of the week to listen to, and information on HSK and language certification. The main page has a rotating area with an illustrated sentence in Chinese and Japanese, and even portions from popular Chinese songs. There is also a Chinese version of the page, which has only the dictionary. We highly recommend this website for learning Chinese!