What resources can I use for learning character decomposition? I'm developing a set of tools meant to aid in learning Chinese characters and I realized that I don't know a good dataset containing character decomposition. Ideally it should be comprehensive (or have as good coverage as possible), machine-readable and available for free (creative commons?). So far I know about Wiktionary and Make Me a Hanzi. What are the other ones?
you may try the 拆字字典:

http://www.kaifangcidian.com/han/chaizi

eg:


【彎】 wan1    〖絲 言 弓 彎〗〖糹 言 糹 弓 彎〗


http://www.kaifangcidian.com/han/chaizi/彎

have fun :)