"This update ensures future compatibility of the Mac App Store included with OS X Snow Leopard, and is recommended for all Snow Leopard users.
System Requirements: OS X 10.6.8"

Here's details from the related article about Snow Leopard Mac App Store Update:

"This update:

Installs a renewed intermediate signing certificate required by the Mac App Store. The certificate ensures that you can continue to use the Mac App Store in Snow Leopard to purchase new apps and run any previously purchased apps that use receipt validation.

Includes improvements to Mac App Store alerts."

This update should also be available via the Apple Menu > Software Update.
  

"Apple has determined that, in very rare cases, the two prong Apple AC wall plug adapters designed for use in Continental Europe, Australia, New Zealand, Korea, Argentina and Brazil may break and create a risk of electrical shock if touched. These wall plug adapters shipped from 2003 to 2015 with Mac and certain iOS devices, and were also included in the Apple World Travel Adapter Kit.

Customer safety is always Apple's top priority, and we have voluntarily decided to exchange affected wall plug adapters with a new, redesigned adapter, free of charge. We encourage customers to exchange any affected parts using the process below.

Note: Other wall plug adapters, including those designed for Canada, China, Hong Kong, Japan, United Kingdom, and United States and Apple USB power adapters are not affected by this program... "

See the exchange program page for info/pictures on how to identify affected adapters.
  

• Little Snitch 3.6.3 (release notes lists uninstaller crash fix for v3.6.2)
  
  
• Epson Printer Drivers v3.2 for OS X (apple D/L page - 1.3GB)
  (as with all printer driver updates, check if your model has an update at printer mfr site, vs downloading entire large file set. And if you're not having any problems, don't update.)
  
  
• Lexmark Printer Driver 3.1 for OS X (apple page)
  
  
• Xerox Printer Drivers v4.0 OS X (apple page)
  
  
• NGR Printer Drivers v3.0 for OS X (apple page)
  
  
• Gestetner Printer Drivers v3.0 for OS X (apple page)
  
  
• Infotec Printer Drivers v3.0 for OS X (apple page)
  
  
• Lanier Printer Drivers v3.0 for OS X (apple page)
  
  
• Savin Printer Drivers v3.0 for OS X (apple page)
  
  
• Apple Reportedly Set to Refresh Its Macs Later This Year (motley fool)
  
  
• Company of Heroes 2 upgraded with Mac vs Linux multiplayer (feral interactive)
  
  
• Apple's virtual reality headset: What's the story so far? (pocket-lint)
  
  
• Watchup's Apple TV app wants to be the Pandora of news (verge)
  
  
• Important Notice for Certain AC Wall Plug Adapters & World Travel Adapter Kit Customers (PR on recall above)

• About the Mac App Store Update for OS X Snow Leopard
  
  
• Printer & scanner software available for download for your Mac
  (Ref: printer driver updates above. See legend on new/updated driver notations in doc.)
  
  
• Edit your photos using third-party extensions in Photos for OS X
  
  
• How to Use AirPlay to wirelessly stream content from iTunes on your computer
  
  
• If your videos from iTunes can't be played on your iPhone, iPad, iPod, or Apple TV
  
  
• How to Listen to Apple Music Radio
  
  
• Get help backing up your device in iCloud
  
  Apple TV Related:
• (How to) Set up AirPlay on your Apple TV
• (How to) Put your Apple TV in sleep mode
• (How to) Restore your Apple TV through iTunes
• Get help with third-party apps on your Apple TV
• About the App Store on your Apple TV (4th generation)
• (How to) Charge your Siri Remote or Apple TV Remote
• (How to) Use a third-party remote with your Apple TV
• (How to) Control your TV or receiver with your Siri Remote or Apple TV Remote
• (How to) Use your Siri Remote or Apple TV Remote with Apple TV (4th generation)
• Get help with audio, video, or power (problems) on Apple TV
  
  
• (How to) Set up Remote for your iPhone, iPad, or iPod touch
• If the Remote app won't connect to iTunes or your Apple TV
  
  
• (How to) Back up your Apple Watch
• (How to) Use third-party apps on your Apple Watch

Topic-based page of How-To, Troubleshooting & Tips for Mac/OS X/iOS Users.
  

• UnrealEngine 4.11 Preview 4 Released For Early Adopters (UE blog)
  
  
• Firefox 44.0 release notes & security fixes