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Good straight to the point faq, covers specially confusing points
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http://www.open-std.org/jtc1/sc22/wg14/www/standards
Official directory containing the latest free draft versions of the ANSI c specs
The latest is: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf
The closest to the ANSI standard that you can get for free (it is a paid standard...)
This should be quite close to the actual specifications
Quite readable, and fun to find obscure features which you had never heard of before!
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http://locklessinc.com/articles/obscurec/
Obscure stuff only. Cool.