Everyone loves to get loads of traffic to their websites, however, websites get timed out or respond very slowly when many users try to access it at the same time. WordPress does a pretty good job of handling lots of users at once, however it in itself cannot help you manage all the traffic, and

More at: http://weblogtoolscollection.com/archives/2010/03/27/scaling-wordpress-part-1-using-mysql-replication-and-hyperdb/