That's not an alias, it's a Symlink... I wouldn't go deleting them either. You're starting to mess with parts of the UNIX subsystem that you don't know anything about.
I had this exact problem on my iMac about a year ago and started a thread. I got the answer. Install Developer Tools from your Install DVD and run the following in Terminal in Mac OS X (not the DVD). If this doesn't work (it was perfect for me), reinstall.
Code:
sudo /Developer/Tools/SetFile -a V /bin
sudo /Developer/Tools/Setfile -a V /cores
sudo /Developer/Tools/Setfile -P -a V /etc
sudo /Developer/Tools/Setfile -a V /mach_kernel
sudo /Developer/Tools/Setfile -a V /private
sudo /Developer/Tools/Setfile -a V /sbin
sudo /Developer/Tools/Setfile -a V /tmp
sudo /Developer/Tools/Setfile -a V /usr
sudo /Developer/Tools/Setfile -a V /Volumes
sudo /Developer/Tools/Setfile -P -a V /var
Then delete the files that start with /Library/Caches/com.apple.LaunchService. There should be two.