From my observation on this discussion there seem to be no other parties beside TLD operators that are currently so much interested in setting up anycast services. At least, nobody said so on this list. Some DNSBL operators are definitely interested.
DNS Black Lists are part of the crtitical email infrastructure. Someday a bogon routeserver service like this one: http://www.cymru.com/BGP/bogon-rs.html might want to use anycast. It is part of the critical routing infrastructure. It would be good for the policy to be based on the principle of supporting fault tolerance for critical infrastructure and then it can have a checklist of indicators like TLD operator, anycast implementation, freely available service and so on. It is a good idea to have a checklist that makes the policy easy to implement by the hostmasters, but it is also a good idea for the policy to have a clear foundation statement to cover anything that was not considered in the checklist. --Michael Dillon