It's been a while since I've visited spider's page, but I was pleasently surprised to see a short tutorial on setting up procmail with multiple filters. IE: send incoming email through spamassassin, then bogofilter, then sort into mailboxes. Nifty stuff. Sad that we have to resort to filtering through so many different programs just to make email usable, but sadly that's the way it is these days. Until we get to draw and quarter the spammers of course.
He also has a gentoo migration guide as well, for moving to gentoo with minimul downtime.