Disable Spotlight in Mac OS X 10.5
It seems like people either love or hate Spotlight, if you love it then ignore this tip, but if you hate Spotlight and want to turn Spotlight off in 10.5 here’s your new favorite post. You can completely disable Spotlight in OS X 10.5 by moving a few system files (or you could delete them but that is strongly not recommended for various reasons). Here are the files you should move, be sure to place them in another location for backup in case you want to enable Spotlight again.
Move these two files to another safe location and then reboot your mac
If you want to re-enable Spotlight just move those files back to their original location, reboot, and Spotlight will work again. Please backup the files, if you delete them you will not be able to re-enable Spotlight without a system reinstall!