I'm glad I'm not the only one who's anal about redirecting to the canonical host name. Now, let the bike-shedding begin: should the canonical host name be www.foo.com or foo.com?
The reason I say this is for smaller operators who may not be running multicast'ed servers in 3+ geographical areas, then you'll probably want most of your traffic pointing to a CNAME of a CDN or at least a cloud-hosted load balancer.