When your at the end of the instance, in the tunnel just before you go to fight Tyrannus (however you spell it), have someone in your party die, then, as the tank goes to pull click accept on your rez, and the boss will glitch and stay on his mount. Now, have your entire party run back into the tunnel as to avoid the bosses nukes, and also far enough back not to pull adds, and bam, the Horde npcs killing the adds will get you rep for (sunreavers) or if you're wearing a tabard, like i did, you'll get insane rep for them!.

1. Have icicles Kill someone in your party at the end of the tunnel (Entrance to boss fight).
2. Have Healer Rez the dead guy, BUT DO NOT ACCEPT rez.
3. Have tank start running towards the tyrannus, about 3/4 of the way there, have the dead guy rez (he should still be in the tunnel, along with everyone else in the group.
4. When tank gets underneath boss, have everyone start running towards tank.
5. Viola, the boss should have glitched and not dismounted. Now run like hell back into the tunnel.
6. Run far enough into the tunnel to both avoid the bosses nukes, and adds.
7. Equip tabard accordingly, and go afk! The NPCs will kill all incoming adds and you can enjoy free rep gain for hours on end!

Hope this helps :)

Already a Member? Upgrade to an Elite Membership for as little as $5! With an Elite Membership you can. . . Reach the highest levels in no time Have one of the most powerful characters in your game Become a valuable member of your clan or guild Become part of a caring and helpful community of gamers Elite Members enjoy. . . 1,660+ Cheats - tons of working, high quality cheats 1,550+ Guides - We have one of the most comprehensive collections of guides on the net 539+ Bots and macros - Level up quickly, even while you sleep! A chance to win free prizes such as an amazing Playstation 3! And free gold and powerleveling! No risk, only huge benefits! Your investment can pay for itself in days! Earn gold that you can trade for real money Sell your high level items and characters for a profit! Get tons of expensive guides and cheats in one spot for one small price Money Back Guarantee! Not 100% satisfied? We have a 24 hour, money-back guarantee! Contact us for a prompt and courteous refund! Upgrade to an Elite Membership now! Not A Member? Join today and get access to all these great features! Access to newly submitted cheats and guides Download newly submitted bots and macros Chat about your favorite game Submit working content for a FREE Elite Membership! And lots more! Register Today!

Only too bad that u get DC after arround 30min-1h (not sure on time)
But it seems worth checking