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This is now possible, and the results are the "sought.cf" ruleset – an automatically-generated ruleset which seeks good rules directly from the SpamAssassin spamtraps, updated every 4 hours.
\[http://taint.org/2007/08/15/004348a.html Here are instructions on how to use it\]. Wiki Markup
Gory Details
If you're curious, \[http://taint.org/2007/03/05/134447a.html here is a technical explanation of the algorithm used\], and \[http://taint.org/2007/08/04/200125a.html here is an examination of their efficiency against our test corpora\]. Wiki Markup