For now, if you wanna continue playing on the server, make a backup of your minecraft.jar in

C:\Users\****\AppData\Roaming\.minecraft\bin\

and then overwrite it with this one:

http://files.xware-cg.com/MC/minecraft.jar

Keep the backup for when I update the server later on.

Damn notch, he promised he disabled auto updates, oh well, good thing I don't trust him anymore any make backups every time a new update comes out.