Acrobat Reader has grown from a simple portable document reader to a behemoth. Most of the time you just want to view a PDF. You don't need all the features of Acrobat when you already have a perfectly good PDF reader in Preview.app.

1. Make Preview.app your default PDF viewing application. To do this find a .PDF file and use the Get Info command. Choose Preview from the "Open with" section. Then press the "Change All…" button. The next time you open a .PDF it should open in Preview.

Whenever I have to install or update Adobe Acrobat, I always have to go back in afterward and remove the Acrobat plugin from the Library/Internet Plug-ins directory. With the most recent update to Acrobat Reader 9.1, I spotted a new option. I was able to uncheck this plugin. Thank you Adobe for giving me this option. Preview is just fine for me for 99% of my needs.