Want to configure postfix/spamassassin and wonder which RBLs to choose? I found a cool site which monitors ham and spam hit statistics of a lot of RBLs. Check out http://www.intra2net.com/en/support/antispam/, it’s worth a visit.
My definite winner is zen.spamhaus.org. While having the highest spam hit quote, it has 0% ham hits.