This issue was resolved in Mac OS X v10.6.2 which allows you to dismiss any additional Software Update windows after installing Rosetta.
To update to Mac OS X 10.6.2 or later, choose Software Update from the Apple () menu.
When installing Jampacks on Mac OS X v10.6, you may be repeatedly prompted to install Rosetta but the installation never completes. When this happens there may be multiple Software Update icons in the Dock.
This issue was resolved in Mac OS X v10.6.2 which allows you to dismiss any additional Software Update windows after installing Rosetta.
To update to Mac OS X 10.6.2 or later, choose Software Update from the Apple () menu.