It's well known that filtering is *only* useful for keeping one's inbox uncluttered; it does nothing to interdict the flow of crap from upstream. You want to put a serious dent in spam? IDP broadband providers that give their customers direct access to port 25 on remote systems by default. Spam from AOL dropped to almost nothing once they did that. It's not trivial to filter outbound port 25 traffic but if you want to provide large-scale broadband access, it's mandatory to curb abuse. It takes money, expertise, and most importantly, the corporate will to be a good net neighbor and take responsibility for their users' actions. Most broadband providers have all but the latter; an IDP gives them incentive to get it or lose the rest.
Or what I would like to see is large Broadband ISPs publically disclose the IP blocks which are not supposed to be sending mail to begin with. (Comcast.net comes to mind right away which CLEARLY states in their Terms of Service you are not supposed to be running web/mail ect ect servers)
This would allow the recipient to make the concious decision to block at firewall/mta/contentfilter, which will then reduce the blocking of legitmate mail servers which happen to be in dynamic block.
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