Someone else mentioned this in another thread, but I think it deserves a thread of it;s own....
There's a huge two dragon fight in this game that is very rarely run. It could definitely be used as additional end-game content, but there's no point in running it...
Chest loot tables are worthless at end-game, so a few extra chests doesn't mean anything. Now, add a couple of awesome named items to those chests, and suddenly, you've just added some more content for the capped characters to run...