Interesting. I wonder how many servers other MMOGs launch with, as well as how long it takes them to double their launch number. This isn't a cheerleading post, but I also don't want it to denigrate into a hate post, so if anyone knows numbers of other (past and present) MMOGs at launch, please give some insight.
Quoted from the "Free Trial Extension" thread on the WoW forums.
Since its release two and a half days ago, World of Warcraft has already seen incredible concurrency numbers across all active game servers. To keep up with the demand from our players, 47 new servers were made available, increasing the total number of servers to 88. Doubling our server capacity in such a short period of time created issues in existing servers. We immediately recognized the issues and began implementing fixes. However, some players were unable to log in and enjoy the game during this period.
We sincerely apologize for any inconvenience and are dedicated to providing World of Warcraft players with the best play experience possible. Therefore we'll be adding a small trial-period extension for players who created accounts before or during the downtime. In the days ahead, we'll provide additional details on how the trial-period extension will be determined. As always, we appreciate your continued patience and support; we're still monitoring the servers very closely and making adjustments as needed in order to ensure that World of Warcraft continues to run smoothly for everyone playing.