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With Leopard and prior versions of OS X, one of the popular maintenance utilities was AppleJack, which is a free SourceForge project and ran in the Terminal (preferably Single User mode) as an easy-to-access way to run a bout of cleaning functions on the Mac. AppleJack so far has been incompatible with Snow Leopard, but with today's update the Snow Leopard incompatibility has been squashed.
AppleJack 1.4.3 final edition released; Intel-based Mac compatibility
Whither AppleJack? UPDATE: Intel-based version available
Utilities Updates: AppleJack 1.4.2; Google Maps Plugin (Universal Binary) 2.3; Ghost Sphere 1.2.4; more
Troubleshooting Tools: AppleJack
Utilities Updates: Impression 2.7; AppleJack 22.214.171.124; iTattle 1.5; System Optimizer X 4.6.1; more
Utilities Updates: AppleJack; NAV defs; FireFox; UltraPointer; Screen Query; Synchronize! Pro X; MailArchive; Uninstaller
There are a variety of tools available for managing your hard drive's structure and data. Most are shareware utilities that give you function or time limits until you register the program, but there are a few out there that are both useful and free.
Our Weekly Utilities Update report is a list of all the updates for many Mac utilities that have been released in the past week. Though utilities can be any tool that helps you perform a routine task (including image manipulation and synchronization), our focus in this column is to bring you those tools that help in troubleshooting Mac hardware and software problems
When it comes to troubleshooting the Mac, there are many cheap and some expensive utilities you can buy to get the job done; however, there are also some very robust free options out there.