I dont know if this has been posted but here it goes.
In Silithus you farm for twilight pages, from mobs, you can get many in 1hour farming.
Instead of delivering them for rep, deliver them at the cave for a guy near hive regal.
We will send you mails after with some stuff, some scrolls, some items to summon specific dukes and lesser ones, but also blue items (recepies for drakrune objects), i took in 100 pages 6 to 7 blues and sold them in AH.
Not a guide to make easy money but you can get some money this way.