Dock Spaces is a tiny application that allows you to have 5 different docks and swap anytime you want from the menu bar.
What Dock Spaces have?

• 5 Different docks
• Set bouncing
• Lock Dock items
• Translucent hidden apps
• Switch from/to 3D/2D
• Add Recents Stack
• Enable mouseover Stack
• Reset to the original Dock
• New empty Dock
• Growl
• Software update
PS: If you make any changes to your Dock wait few seconds so Finder updates the plist file

Website
Download Dock Spaces