Rob Schmidt in IST sent me the following link: Orion Technical Information. Under tools, it has a looking glass, which allows you to see if a peer is on the Orion Network. Ideally when we're doing large network operations like, say, setting up a mirror, we will choose a peer that's on Orion, as it's both faster and cheaper.

Generally speaking, one can expect most universities to be on Orion. Some large research organisations, like NRC, are as well.

-- MikePatterson - 22 Apr 2005