Only, you know, it's Rob and not Louis. - Cyndy

Ooops. It's on louisgray.com, thought. :-) - Dave Winer

Federation is simply the beginning of the solution for a micro-blogging service. You'll also need a dynamic load-balancing system that is capable of spreading the load of requests for content acroll multiple servers. For example, a popular microblogger (eg. Scoble) might be replicated across all servers, while a mid-level microblogger may only be distributed across a few. The average microblogger may only be on two or three servers depending on the redundancy requirements. - Jim McCusker