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This page has the list of channels that can be used with sa-update to obtain additonal additional rules from the http://www.rulesemporium.com/rules.htm SpamAssassin Rules Emporium. SARE rules catch many different specific kinds of spam, including adult, spoof, stock tips, fraud spam , etc.
Daryl O'Shea provides a series of channels for every set of SARE rules so you can easily customize which ones you want to update. Here is the http://daryl.dostech.ca/sa-update/sare/sare-sa-update-howto.txt howto Daryl provides.
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