Low-latency, large-scale message queuing

Question

I\'m going through a bit of a re-think of large-scale multiplayer games in the age of Facebook applications and cloud computing.

Suppose I were to build something on top

Answer 1

FWIW, for cases where intermediate results are not important (like positioning info) Qpid has a "last-value queue" that can deliver only the most recent value to a subscriber.