Hi,
Whilst Men & Mice are getting kudos on their contributions, thought I
would throw my stuff out there.
I got infuriated with our Cisco load-balancer and the complications they
create, so I put together documentation on putting together a OSPF
backed anycast'ed DNS resolver service (with unbound, but really could
be with anything):
http://www.digriz.org.uk/ha-ospf-anycast
Also, for ages now we have been doing DNS blacklisting with unbound
(trivially adaptable for other resolvers though):
http://www.digriz.org.uk/dns-malware-blacklisting
Hope people find these useful.
Cheers