The Cacheboy CDN is currently pushing about 1.2 TB a day (~ 100mbit average) of mozilla and videolan downloads out of 5 seperate CDN locations. A couple of the servers are running LUSCA_HEAD and they seem to handle the traffic just fine.
The server assignment is currently being done through GeoIP mapping via DNS. I've brought up BGP sessions to each of the sites to eventually use in the request forwarding process.
All in all, things are going reasonably successfully so far. There's been a few hiccups which I'll blog about over the next few days but the bits are flowing, and noone is complaining. :)