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the Language API. This new API boasts two functions, language translation and language detection - which cover 13 languages and 29 translation pairs.
Google AJAX Language API [googleajaxsearchapi.blogspot.com]
A boolean representing whether or not the detection interval believes the language code is reliable for the given text.
A numeric value between 0-1.0 that represents the confidence level in the language code for the given text.
I wish there were more information on the methods being used to determine reliability and confidence. Details aren't necessary but I tried out their test page there and keyed in the Spanish word for Hello, Hola. Response:
SPANISH ( not reliable : 0.09097684)
Hmmm. Initial response on Google AJAX Language API: NOT RELIABLE
Or at least not building much confidence yet.