My current favorite online Chinese dictionary, Dict.cn has recently been upgraded with lots of new features. For instance, while Chinese Perapera-kun already takes care of this for me, non-Firefox users will appreciate the automatic look-up of highlighted words.
Personally, my favorite feature is the 每日课堂, which will allow you to learn a little bit of Chinese every day with a little story or even just a simple sentence. While this site and most of its features are obviously geared for Chinese speakers learning English, the fact that 每日课堂 has both English and Chinese makes it a valuable resource for us learning Chinese as well.
I have been putting on weight.
I have in fact, been putting on some weight lately so the sentence above is nice to know. 我要少吃多运动。
Finally, this might have been there already, but they also have a 繁体字 dictionary. Technologically, there should be no reason why it would need to be split up but I guess I shouldn’t complain since the site is already free and useful.