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Re:Language detection with Google's Compact Language Detector by ninjin on Saturday October 22, 2011 @11:12AM (#3143642)
Mark Pilgrim reversed (or ripped out, can't remember) the encoding detection that Firefox uses. It has done a fairly good job for my web crawling:

http://pypi.python.org/pypi/chardet

Re:Language detection with Google's Compact Language Detector by e98cuenc on Saturday October 22, 2011 @11:20AM (#3143655)
In my experience chardet misclassifies very often iso-8859-1 as iso-8859-2. I saw the misclassification even in small spanish pages, which were using only the typical spanish characters.