Simple and Advanced combined - Bartender4 ActionBar AddOn
EBB adds groups of bars to your screen showing you which (de)buffs currently affect your toon or some other units.
Display bag usage on each of your bag slots.
A lightweight, flexible, multi-target threat meter.
Adds a button to undress the model in the Dressing room.
Shows ZoneInfo on the World Map in a perfectly cromulent fashion.
Helps track the closest plants, deposits and treasure locations on your minimap.
Unit Frames of awesomeness. Woof. It'll bite your face off.