Quest-I-On (WoW 2.0 update) 

QuestIon (pronounced Quest - I - On) is a very customizable and configurable window for tracking quests and objectives.

What's New in v1.6.3:
-- fixed bugs in WoW 2.3

Features:
- Easy-to-use drop down menus for configuring
- Each quest can be configured individually
- Sort quests by level, location, or by title
- Filter quests by current location or level
- Collapsable location headers
- Auto-Fade and Auto-Minimize window options
- Auto-Show quests on objective pickup
- Configurable font sizes
- Configurable defaults for new quests
- Global commands to change an option on all quests
- Set which corner the window grows/expands from
- Disable quest fading when getting new quests from NPCs
- Quest titles are displayed with the quest level and quest difficulty color
- Customizable colors for the window background, new objectives, and finished objectives
- Objectives change color as they are completed
- Current number of quests is easily displayed
- Bindable keys for hiding and minimizing
- Clicking on a quest title opens your Quest Log to that quest
- Improves drop down menu behavior

In-Game Usage:
Left click and hold on the title moves the window
Right click on the title opens the main menu
Left click on a quest title opens the quest log to that quest
Shift-left click when the chat edit box is closed will add/remove the quest from Blizzard's Quest Tracker
Shift-left click on a quest title adds it to the chat edit box
Ctrl-left click on a quest title attempts to share that quest
Right click on a quest opens the quest configuration menu
Shift-right click on a quest title adds the quest objectives to the chat edit box
Ctrl-right click on a quest title allows you to abandon that quest

Slash commands:
(Either /qio or /qi will work)
/qi show - Show the QuestIon window
/qi hide - Hide the QuestIon window
/qi resetpos - Reset the QuestIon window position