However, before you do, copy plugins, custom brushes, actions, custom help files, etc. from CS2 folders into the appropriate folders for CS3.
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Uh, that's ok for presets, brushes, actions but NOT for "plug-ins". The safest way to install plug-ins is to use the installer provides by the developer, not just copying them over. First off, the odds are you'll need updates for CS3 and only 3rd party plug-ins can be moved. Never, ever move Photoshop installed plug-ins between versions. Photoshop installed plug-ins are version specific.