IP blocks allocated to organizations in various countries (updated daily):
http://www.completewhois.com/statistics/data/ips-bycountry/rirstats/
Configuring firewall (openbsd way on the buttom, replace bogon example
with appropriate other list you want):
http://www.completewhois.com/bogons/using_bogon_lists.htm#firewall_examples
CIDR -> firewall scripts for some systems (not needed for openbsd which
accepts cidr ip block list directly with ph):
http://www.completewhois.com/bogons/data/scripts/
P.S. Still looking for somebody to document and if necessary provide scripts on how to do it with netbsd, aix, hpux. Volunteers?
(and I'll do solaris myself if I ever get around to it...)