Not a bad column on database normalization. Gives some layman explainations with the standard dry one.

I am very happy to see this. OpenBSD guys made a whole pf section. As the pf services get more advanced this becomes so important. With my recent renewed inerest in OpenBSD I trust this will get me up to speed quickly with PF since version 3.2.
PF: The OpenBSD Packet Filter

This will be helpful for the greylisting. OpenBSD's implementation.
Manual Pages: spamd(8)

The Next Step in the Spam Control War: Greylisting
This is beautiful, it has many benefits. Best of all it works at the MTA level, making it real thin. Check it out, you really should. In the near future I will be implementing this with OpenBSD, a new daemon by them spamd.

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Interesting information on multi-language database schema. Disscussion.
sitepointforums.com/...