How do I uninstall Adobe Reader 9 for Mac?

You should be able to just delete the application and its associated files. This thread has a list of things and discussion of what to delete. Make sure to remove /Library/Internet Plug-Ins/AdobePDFViewer.plugin if you've installed the Safari in-browser viewer from Adobe.

For most applications, OS X doesn't have installers, or uninstallers, per se. Usually, you simply drag the application Icon to the Trash Can. The app icon (Something.app) is a whole directory. However, this doesn't work for every program.

To remove all traces of a program, if it littered the OS with other files, you might need a program like AppCleaner.app or you can follow this guide for more information.

Adobe's site

To uninstall Acrobat 9 in Mac OS

1. Double-click the Acrobat Uninstaller file, located in the Adobe Acrobat 9 folder.
2. Follow the on-screen instructions to uninstall Acrobat.
3. In the Authenticate dialog, type the user name and password for an administrator account and click OK. Note: The uninstaller removes only Adobe Acrobat 9 and 9.1 files from the system. It does not remove Adobe Reader files, Acrobat user data, or files that are shared with other Adobe applications.

Easy solution. Use App Cleaner. First- Drag Adobe Reader from your applications folder into App Cleaner. Next- press "others" tab in App Cleaner- this will display Adobe Reader plug in(s). Delete any plug ins shown- then go to "applications" tab and delete all files shown.