This thread is for sharing the instance and raid tactics for the Tactics (GD)In TBC days I used a addon called "Tactics (GD)".
Tactics (GD) download from CurseIt's a addon that announces customizable text into any chat (typically party/raid), based on parameters (e.g. generic tactics for the instance) or current target (typically, a boss).
So instead of typing many lines how things go when at boss, you can select the boss, type /tactics, and the tactics will be announced to all.
Unfortunately the tactics have not been updated to WotLK

However, all the tactics for the addon are in a single .lua file, and one can write anything in it, so WotLK tactics can be easily added/edited.
DESCRIPTION.LUA for TACTICS(GD)edited descriptions.lua stored in google code "wowfiles"
http://code.google.com/p/wowfiles/Download / Checkout (you do need subversion for this)
svn checkout http://wowfiles.googlecode.com/svn/trunk/ wowfiles-read-only
Installation: copy the descriptions.lua to the actual addon dir where your wow is installed
if someone wants/needs edit rights, the access request should be possible at google code, but if not,
send me (Zemalf) a PM with your google account email (I think that's needed for google code).
GENERIC INFO ABOUT TACTICS:Ideally the tactics are number of one liners that aren't too long. (to avoid wall of text to chat at once).
The tactics in the release version are more and less descriptions of what each boss does (copy-paste from wowwiki or such), which I don't like too much, but it's something. and like said, it's customizable.
There is a template below. The format is:
name: List of actual mob names that the description can be applied to. This is used when you bind a key to
report tactics on the currently selected target, so the name has to be exactly correct
shortName: List of shorthand tags for the description. For use with the /tactics <mobname> and /tactics all commands
instance: Shorthand tag for the name of the instance that the mob occurs in
description: The text that will be output in chat.
Notes: Don't add color, it causes disconnects; don't use double quotes within the text; each separate line sent to chat must be 255 characters or less.
-- TEMPLATE
{
name = { "BossName", "Name" },
shortName = { "name" },
instance = "instance",
description = {
"Line1",
"Line2",
"Line3"
}
},
-- EXAMPLE
{
name = { "Hogger", "Hog" },
shortName = { "hogger", "hog" },
instance = "world",
description = {
"Hogger:",
"Hogger is a lvl 11 elite who is much tougher than he looks. Take a raid group of 40 nekkid level 1 trolls."
}
}, -- this comma is not necessary for the very last description in the list