Hi Tech Teacher,
I don't know if still needed, but you can download Onyx from Titanium website, which is a multifunction utility (for example the leopard version allows you to verify the Startup Disk and the structure of its System files, to run misc tasks of system maintenance, to configure some hidden parameters of the Finder, Dock, Dashboard, Exposé, Safari, Login window and of some of Apple's own applications, to delete caches, to remove a certain number of files and folders that may become cumbersome and more.)
Onyx
And of course update the OS and applications (clic on the apple, system preferences, update) or throught the apple website.