Everything in that blog post is part of Windows 7 with the Live Essentials suite installed.
So instead of buying Windows 8 - just learn how to use the software you have correctly.
On a related note: Software isn't a replacement for good parenting. If you let your kids do whatever they want on the internet then you only have your self to blame when meatspin melts their eyes.
Not quite, this one also ties into Microsoft Accounts instead of a single machine's Windows account. But yes, this is just another example of Microsoft making great products that no one knows about (Media Center, Zune, Live Essentials, Security Essentials, etc.).