Clean-Install Assistant for Mac

From Marc Moini:

Upgrading a System Folder to a new version of Mac OS often takes a lot of time, because you need to figure out which files (extensions, control panels, printer drivers, application-specific items, special folders, etc ) to move to the new system and which ones to leave behind.

Clean-Install Assistant makes the process easier and faster because it does the sorting automatically (using its list of factory-issue Mac OS files). It'll carefully collect your additions and move them to a separate folder while you update the System Folder, then move them back to the right places inside the new one with a single click!