That's good, but you still have tons and tons of stuff to do till the server can get back to the way it was before. I hope the bukkit supports all the previous plug-ins, because we clearly need them for a decent gameplay. Also a reset is necessary. Some of the players may disagree, such as Jonas ( he already did ), but we need the new resources and the area is really damaged by the creepers again. So I'd say the Creeper Nerf is one of the main thing to add now, also the old ranks so we can punish the griefers. And I'd suggest to close it for a while till we fix it all, that is put on the whitelist.
EDIT: Reset after you add the Creeper Nerf, otherwise it's quite pointless.