As you already probably know the minecrat.net site has been offline frequently, this has caused many problems for persons wanting to update there version of minecraft beta. I won't go in to the details but I'll just make the point that it can be annoying for beta users, what is also EXTREMELY annoying is when users playing the free minecraft creative multiplayer try to retrieve the server list!! There are two really annoying problems that tend to happen sometimes which can be:
#1 Minecraft.net crashes and as a result you can't access the site and if you can't access it that means there will be NO CREATIVE MULTIPLAYER!!! #2 Notch and he's team move some files around and as a result your custom hack client doesn't work any more, ohs no D:
#1 wait until minecraft.net is back up or use a cached version to retrieve the list! #2 Download the newest hack client from the world of minecraft site which should fix this!