OSNews posted a quick guide about removing the AppStore from Mac OS X 10.6.6

Now that the Mac App Store has been snuck installed onto your machine alongside Mac OS X 10.6.6, you might be wondering - is there some way to remove that monstrosity of an application from my Mac? While it's not officially supported, it does seem like Apple has taken this scenario into account.

  Although Not Supported, You Can Remove the Mac App Store