Addons:
LightHeaded
''LightHeaded is a very simple addon that displays quest information and comments from wowhead in game, eliminating the need to Alt-Tab when you get stuck on quest. This addon was inspired by qcomments and wowhead_quests, which both serve a similar purpose. Data is only loaded when you first request it, so you can be sure you're not using more memory than you need to.''
MetaMap
''MetaMap adds features to the WoW world map, keeping all mapping type features in a single place.
Some features are: Adjust the map window size.
Move the map anywhere on the screen.
Adjust the opacity of the window & maps.
Saved sets for toggling between 2 map modes.
Allows full player movement, messaging, etc. with map open.
Adds coords to the main map and the Minimap
Adds Instance maps which open to the correct instance you enter.
Default data included for all bosses & locations etc.
User editable notes for all maps, including instance maps.
NPC/Mob database collectable by mouseover or keypress.
Toggling on/off display of unexplored areas of the map.
Boss Loot Tables displays all the loot dropped by bosses, and more.
Waypoint system to guide you to any set point.
Complete Quest logger with optional history database.
NoteBook module for additional notes, linked to Tooltips.
Inbuilt Import and export facilities for various data formats.
Inbuilt Backup and Restore facilities.
Button on Minimap to open or close the World Map or display MetaMap options.
Key bindings for various MetaMap functions.
Full support for Titan Bar.''