Let's list 'em here ^_^
The one I did so far was the Alliance chain in Redridge. The basic setup is this:
After the Cataclysm, the Blackrock Orcs and the Gnolls team up to fight Lakeshire. Redridge's ace Orc Slayer is John "Rambo" Keesan complete with headband, bow and skinning knife. This is the same guy who was captured by the Orcs you have to rescue in Old Redridge. It's five years later and his mood is the same as his Rambo counterpart. He was shunned by the townsfolk because of his capture and spent the last five years as a free man participating in underground fights in the basement of the Lakeshire Inn. You're sent to recruit him but he flatout refuses, saying he's got nothing to fight for and he's through fighting. His CO thinks you can change his mind and sends you to get his buddies from Bravo Company, who were also captured by the Orcs.
Each member of Bravo Company is a different class, they're all Elite and "join" your party as Guardians (like the Northrend Quests you may have done) for the rescue part of the chain. One's a Mage, one's a Paladin, one's a Warrior and the 4th is a Rogue (I assume). I did it with my 80 Warlock so if you have a mount don't worry, they will keep up with you and from what I can tell, don't get aggro unless they literally run into a hostile. After you get them all plus John's gear, you head back to Lakeshire. Now that Rambo's got his buddies, his trusty axe and bow and most importantly, his red headband, he's ready to slay some Orcs ^_^
In true Rambo-esqe fashion, you travel by riverboat across Lake Everstill to the camp on the other side. "Rambo" wants to blow up the Orc base to the southeast but there's a problem: They've got hostages (the missing people you may have heard about when you first came to Lakeshire). You and a member of Bravo company have to sneak in (regardless of class), steal the key and the rescue the hostages. Once they're free, it's time to blow sh** up! You plant the explosive, get out of there and get back in time to watch the fireworks. Now that the Orcs have been dealt with, it's on to the Gnolls. John wants you to deal with the Archmage in the tower of Igligen first but way in is blocked. Fortunately, General Fangore has the key. Yes, he got promoted (LOL). When you're about to kill the Archmage, he teleports away and leaves an abomination for you to deal with. You haven't seen the last of him, though.
When you get back, John's CO has arrived with a present: A Seige Engine! You're going to drive while Rambo does what Rambo does best all the way to Keesan's Camp north of Stonewatch Hold. With the armies of Orcs and Gnolls wiped out, all that's lft are the leaders (who you may already know). After they're both dead, the Archmage returns and is revealed to be a Black Dragon. During the fighting, everyone except Bravo Company is killed except Rambo. The dragon mage doesn't want to die alone so he takes Rambo with him, crashing into the middle of Lake Everstill. When you get back to Lakeshire, Solomon's people manages to savlage Keesan's Dagger, Bow, Ring and (wait for it) headband. You get your pick of the Ring, Bow and Dagger but you also get his Headband. Wear it with pride when you go into BGs!
Overall it was a pretty epic Queat Chain. There is some phasing of course. I came into Lakeshire for the 3 new FPs at first but Keesan's Camp was empty. I did the chain but didn't see a Flightmaster Added. A real pain when doing it at level, methinks.