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The new Mac App Store may be a useful way to find software for OS X, but some people have expressed their disgust at the store and would rather not have it in their systems. Some even have avoided upgrading to OS X 10.6.6 to avoid putting the store on their systems. While this is a way around the store, doing so will also prevent them from benefiting from the latest security and bug fixes that future OS updates will bring.
          
Some people have worried about the “storeagent” process that appears in the OS X Activity Monitor in OS X 10.6.6. This process is in the “Kit Trade” framework that is part of OS X 10.6.6, and is configured to run on demand when the store is open, and seems to be a version manager to help Store notifies you when updates are available, or to inform the store that a software package is already installed.

MacFixIt reader “Bill” wrote in suggesting that if you have to add the App Store again, you can always install by running the combo update to 10.6.6 or later versions of OS X when available. Also, if you have a backup Time Machine or other backup of the application, you should be able to copy it to your Applications folder and then run a permissions fix the boot drive to run it as it was initially installed.

If you are interested in alternatives to the Mac store on the application, there are few resources on the Web that are similar, including CNET Download.com.