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文字拡大 - 様々な書体で漢字などを拡大表示
http://moji.tekkai.com/
Japanese character reference, shows numerous typographic variants for every character.
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Chinese Etymology Home Page
http://www.chineseetymology.org/
shows the variations and evolution of Chinese characters
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List of abbreviated kanji expressions
http://ja.wikipedia.org/wiki/%E6%BC%A2%E5%AD%97%E7%95%A5%E8%AA%9E%E4%B8%80%E8%A6%A7
This looks incredibly useful