Cairo Dock - also known as GLX Dock - version 2.2 has finally been released! The new feature in this stable release include:

• panel mode
• 2 new autohide modes (hide whenever the dock overlaps the active window" and "hide whenever the dock overlaps any window")
• icons can be displayed when the dock is hidden
• integration of the Me Menu and Messaging Menu applets
• run multiple instances of Glx Dock
• better support for old graphic cards
• new default theme to match the Ubuntu Ambiance / Radiance themes and new wallpaper
• other small enhancements: all the themes have been polished, you can now manage tasks in the Clock's calendar, use tiny URLs in the Drop-and-Share applet, the Dustbin applet handles all the drives and many more.