Very long series which takes you to brd, brs and stuff. Some of us are onto part 11 by the looks of it.
1) Dragonkin Menace (Elite) from Halrendis in Morgan's Vigil, Burning Steppes.
2) Talk to Marshal Maxwell in Morgan's Vigil.
3) Talk to Magistrate Solomon in Lakeshire.
4) Talk to Highlord Bolvar Fordragon in Stormwind.
5) Talk to Magistrate Solomon in Lakeshire.
6) Talk to Marshal Maxwell in Morgan's Vigil.
7) Find Marshal Windsor in Blackrock Depths jail.
8) Return to Maxwell.
9) Find a random "A Crumpled Up Note" drop from a random dwarf in Blackrock Depths.
10) Take said note to Marshal Windsor.
11) Retrieve Marshal Windsor's Lost Information from General Angerforge and Golem Lord Argelmach (two pieces).
12) Escort Marshal Windsor out of Blackrock Depths jail.
13) Meet Marshal Windsor at gates of Stormwind.
14) Escort Marshal Windsor to Stormwind Keep to unveil who Lady Katrana Prestor really is. (Spoiler: Onyxia)
15) Stand way the hell back while Bolvar fights the elite dragons.
16) Travel to Winterspring to find Haleh. Find lots of elite blue dragons and run to the back of the cave, where you'll see a rune on the floor. It's hard to see, so you will die a few times.
17) Haleh tells you to go kill Drakkisath in Upper Blackrock Spire. You will need 15 fairly skilled players for this quest, including yourself.
18) Once you have the "Blood of the Black Dragon Champion", return to Haleh. Drakkisath drops only ONE of these per kill. Yes, one for the entire 15 man group. Not one per person, one per group.
19) Return to Haleh with the Blood and claim your Drakefire Amulet\
http://www.thottbot.com/?i=4829
which is actually the key to onyxia's lair