When you go inside the folder, using Finder, what do you see? If this is indeed a genuine system folder, then running the following commands in Terminal.app should hide it (but it's surprising that it has turned up all of a sudden) --
Code:
defaults write com.apple.finder AppleShowAllFiles FALSE
killall Finder
It's just a guess, but have you recently installed anything from a .tgz/.zip file, or maybe compiled some source code?