Massively takes an interesting look at the server model used by EVE Online.
It's unusual for a MMOG because it doesn't divide the player load
among different servers or "shards." Instead, the same cluster handles the entire EVE
universe and all 300,000 subscribers (total; record concurrent load is around 40,000). The EVE Dev Blog recently announced some upgrades to keep things running smoothly and allow for battles involving over 1,000 ships
. They call the technology StacklessIO