There is a new draft from the IETF GROW working group that attempts to standardize how Anycasted services manage their routing announcements. The draft can be found at:
ftp://ftp.rfc-editor.org/in-notes/internet-drafts/draft-ietf-grow-unique-origin-as-01.txt
Before commenting directly on the draft a review of how ISC operates the F-Root Anycast network is in order.
