Who is affected by the blocking tool?
The average consumer should not be concerned with the media hype concerning the SP2 blocking tool. The tool was implemented to assist mid-market and enterprise customers time to conduct internal testing before deploying SP2. Disable automatic updates and you can install SP2 at your leisure. I would recommend enabling automatic updates, but not to automatically install. I also recommend you never use automatic update to update your hardware or third party software. Use the vendors web site to get updates.