It's easy to hide your entire Mac OS X Dock, but what if you want to only see the applications you have open?
Image: Daniel Dudek-Corrigan
If all you want is an auto-hiding dock, that's a simple matter of heading to System Preferences>Dock and checking "Automatically hide and show the Dock".
But if you want to only see the apps you're currently running, you need a little terminal wizardry.
Open up Terminal, and enter
defaults write com.apple.dock static-only -bool TRUE; killall Dock
The dock app will restart, and should now only show your currently running apps.
If you want to reverse the process, head back into Terminal and enter
write com.apple.dock static-only -bool FALSE; killall Dock