I came across an interesting article about server down time and how it is upsetting WoW players.

With 6 million subscribers, each of whom pays $15 a month, Blizzard Entertainment's online game "World of Warcraft" has become a billion-dollar enterprise.

Now comes the hard part: Making sure WoW is always up and running. Some players are angered by ongoing server problems that have led the game to crash without warning while they were playing. Complaints have also surfaced about long lag times and frustrating waits to even play.

Despite Blizzard's contention that it's been keeping WoW customers informed of system problems at all times, some players contend that the company has been slow to react to complaints and reluctant to offer support when problems arise.

You can read the whole article at Cnet here.