On Android, I use the Hanping Chinese app (which uses CC-CEDICT under the covers).

Online, I tend to favour nciku.com. I especially like the ability to draw characters and search for a match.

http://www.mdbg.net/chindict/chindict.php love this site

為甚麼 不試試用

http://dict.revised.moe.edu.tw/index.html

中華民國 教育部國語推行委員會 編篡

重編國語辭典（修訂本）

中華民國九十六年十二月 臺灣學術網路 四版 ver.2

Recently I've set up my own "chinese notes database" on my android phone because I find lots of chinese english dictionaries don't explain the chinese word's meaning fully. This database is all the chinese notes I've studied and taken in class over the last year organised by a database program that uses keyword searches.

Year's ago I purchased an eletronic dictionary call 中文通 in english its called mandarin king. Its model number is F109. That dictionary is not bad. I still use it once and a while. it's not only a dictonary but it has information in chinese culture/history/teas/opera etc. infact i wish I could emulate that dictionary on my phone it would be a great add-on to pleco.

I recommend www.dict.cn