OP site is unreachable at the moment. I can offer that letter frequency counts (ETNARIOUS?) are vital to basic (pen and paper) cryptanalysis and play a significant part in modern statistical and differential cryptanalysis.
Also, it used to guess what language a text might be in for anthropology and archaeology. The frequency charts for a given language are reliable enough (in a sufficiently large sample, etc) to guide that.
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OP site is unreachable at the moment. I can offer that letter frequency counts (ETNARIOUS?) are vital to basic (pen and paper) cryptanalysis and play a significant part in modern statistical and differential cryptanalysis.
Also, it used to guess what language a text might be in for anthropology and archaeology. The frequency charts for a given language are reliable enough (in a sufficiently large sample, etc) to guide that.