First bit of rewrite for wrath, only handles priest fort currently

AceEvent-3.0/AceEvent-3.0.lua

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+--[[ $Id: AceEvent-3.0.lua 60131 2008-02-03 13:03:56Z nevcairiel $ ]]
+local MAJOR, MINOR = "AceEvent-3.0", 3
+local AceEvent = LibStub:NewLibrary(MAJOR, MINOR)
+
+if not AceEvent then return end
+
+local CallbackHandler = LibStub:GetLibrary("CallbackHandler-1.0")
+
+
+AceEvent.frame = AceEvent.frame or CreateFrame("Frame", "AceEvent30Frame") -- our event frame
+AceEvent.embeds = AceEvent.embeds or {} -- what objects embed this lib
+
+
+-- APIs and registry for blizzard events, using CallbackHandler lib
+if not AceEvent.events then
+	AceEvent.events = CallbackHandler:New(AceEvent, 
+		"RegisterEvent", "UnregisterEvent", "UnregisterAllEvents")
+end
+
+function AceEvent.events:OnUsed(target, eventname) 
+	AceEvent.frame:RegisterEvent(eventname)
+end
+
+function AceEvent.events:OnUnused(target, eventname) 
+	AceEvent.frame:UnregisterEvent(eventname)
+end
+
+
+-- APIs and registry for IPC messages, using CallbackHandler lib
+if not AceEvent.messages then
+	AceEvent.messages = CallbackHandler:New(AceEvent, 
+		"RegisterMessage", "UnregisterMessage", "UnregisterAllMessages"
+	)
+	AceEvent.SendMessage = AceEvent.messages.Fire
+end
+
+--- embedding and embed handling
+local mixins = {
+	"RegisterEvent", "UnregisterEvent",
+	"RegisterMessage", "UnregisterMessage",
+	"SendMessage",
+	"UnregisterAllEvents", "UnregisterAllMessages",
+} 
+
+-- AceEvent:Embed( target )
+-- target (object) - target object to embed AceEvent in
+--
+-- Embeds AceEvent into the target object making the functions from the mixins list available on target:..
+function AceEvent:Embed(target)
+	for k, v in pairs(mixins) do
+		target[v] = self[v]
+	end
+	self.embeds[target] = true
+	return target
+end
+
+-- AceEvent:OnEmbedDisable( target )
+-- target (object) - target object that is being disabled
+--
+-- Unregister all events messages etc when the target disables.
+-- this method should be called by the target manually or by an addon framework
+function AceEvent:OnEmbedDisable(target)
+	target:UnregisterAllEvents()
+	target:UnregisterAllMessages()
+end
+
+-- Script to fire blizzard events into the event listeners
+local events = AceEvent.events
+AceEvent.frame:SetScript("OnEvent", function(this, event, ...)
+	events:Fire(event, ...)
+end)
+
+--- Finally: upgrade our old embeds
+for target, v in pairs(AceEvent.embeds) do
+	AceEvent:Embed(target)
+end

AceEvent-3.0/AceEvent-3.0.xml

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+<Ui xmlns="http://www.blizzard.com/wow/ui/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.blizzard.com/wow/ui/
+..\FrameXML\UI.xsd">
+	<Script file="AceEvent-3.0.lua"/>
+</Ui>