This site allows you to look up what words a character commonly occurs in and what possible problem there are, thus allowing you to answer question like when you should use 欲 and 慾 or 善 and 擅. It also has numerous pages detailing the difference between tricky pairs. It should be mentioned that this is a site in Hong Kong, so standards may vary a bit.
東東錯別字詞典：網上中文錯別字字典 (Chinese Spell-checker)
Submitted by Olle Linge on 18 March, 2014 06:50
Intermediate Advanced Web Vocabulary Traditional-Characters Tools-and-Apps
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