Here is a list of official Google Blogs:

The Official Google Blog - Insights from Googlers into our products, technology and the Google culture.

AdWords Agency Blog - The latest from Adwords from you and your client.

AdWords Retail Tips - Adwords tips for the retailers

AdSense Blog - A look inside Google AdSense. With newbie, optimization, AdSense features, and more.

Adwords API Blog - The official source of information about the AdWords API from Google.

Adwords Blog - Google’s official blog for news, information, and tips on AdWords.

AJAX Search API Blog - At this Blog Google gives info about how to use the AJAX Search API.

Google Affiliate Network Blog - News, views and product information for Google affiliate network advertisers and publishers.

Analytics Blog - Here you can get the latest news, tips, and resources from the Google Analytics team.

Android Blog - Blog for developers working with Android, An Open Handset Alliance Project.

Base Blog - Get news, tips, and resources straight from the Google Base team.

Blogger Blog - The Official buzz from blogger.

Checkout Blog - The official Checkout Blog with news for sellers using Google Checkout.

Code Featured Projects - Blog about featured projects on Google Code.

Code Updates Blog - Read all about the latest Google Code updates at the Code Blog.

CPG Blog - News and notes from Google’s Consumer Packaged Goods (CPG).

Custom Search Blog - The latest news, updates and tips from the Custom Search Engine team.

Data APIs - Official Google Data APIs blog.

Desktop APIs - Your official source on the Google Desktop APIs.

Docs Blog - News and notes from the Google Docs team at the official Docs Blog.

Enterprise Blog - A blog about enterprise information, search, and the users that live there.

Feedburner Blog - The Official Feedburner blog of burning questions.

Finance Blog - News and views from the Google Finance team.

Gadgets API Blog - Intended for people who use the Google Gadgets API to write gadgets.

Gears API Blog - Keep up to date on Google Gear’s progress with Gears API Blog.

Gmail Blog - News, tips and tricks from Google’s Gmail team and friends.

Grants Blog - We started this Blog as a place to read about the latest Google Grants news and information

Let’s Take it Offline - The latest news form Google’s TV, Print and Audio Ads team

Lat Long Blog - News and notes by the Google Earth and Maps team

Are we missing any? If you know of more official Google Blogs leave a comment!