Whenever a guild heroic group is formed the conversation goes something like this:

"Where do you all want to go?"
"I don't know, what instances does everyone need?"
"What do you need from heroic <x>?"

...and then every single time I have to go to Wowhead to look up loot tables. Some of these are "I'm not sure but probably" items. I should make a separate list for Naxx and the craftables.