I can't get over how great this item bar is.

On single class teams when they get the same quest reward, drag the item to the bar, hit the hotkey and all of them have the new item equipped.

On quests, drag the quest item to the bar, aquire the target on everyone, hit the hotkey and everyone gets the quest done.

With drops that start quests, drag it to the bar, hit the hotkey and everyone pops open the quest dialog.

Mage food/water, healthstones, pots, etc really useful while leveling up as these items frequently change and all you need to do is drag the new item onto the bar on one character.

I love the item bar.