When do the player data files update in Minecraft SMP servers?
Minecraft's SMP servers are ever changing and really need to be kept up with daily. Luckily, you can find plenty of online resources to help you locate them, as well as teach you how to work within the servers themselves.
It should also be noted that you can design your own SMP server if truly needed.
You can find out all the above information in more details and a list of websites that offer a list of SMP servers.