My question is, what next? How to you turn a swarm of small, transient mirrors, potentially not just on EC2 but all over the 'Net, into something findable and load-balanced to deal with the (potentially) huge demand of serving Wikileaks traffic?
Therein lies a problem. Round-robin DNS load-balancing with a very short TTL is one obvious approach, but this begs the question of how one boot-straps and then maintains the CNAME record containing the list of mirrors. The stable domain could be a CNAME to DNS servers that are themselves part of the mirroring swarm, if each node acted as both a DNS and an HTTP server. Each node would return a randomized list of the nodes in it's neighborhood.
Apart from that, I'm not much further along in my thinking. What do you think about the feasibility of the idea?