>   I think it could be useful for classification of spam.  Apply
> this filter and then do bayesian stuff.  I bet it would significantly help
> in classifying wordy spams as spams (Bayes will not do so well with things
> like Nigerian spam messages).

Not sure why you'd think this, but POPFile (a "pure", i.e.
non-Grahamesque) Bayesian filter does extraordinarily well with 419s,
Nigerian, and similar spam.

For me, anyway.