Here is the list of official Google blogs on various topics including product updates, developer blogs, code snippets, information for advertisers and partners and regional blogs.

You may check out Google Blog Directory. Google provides an iGoogle Gadget. You can as well install the customizable iGoogle blog tab, which will always show you the most recent blog updates by categories.

Google-wide Blogs

• The Official Google Blog – Insights from Googlers into our products, technology, and the Google culture.
• Public Policy Blog – Google’s views on government, policy and politics.
• Mac Blog – Macs inside Google.
• Online Security Blog – The latest news and insights from Google on security and safety on the Internet.
• Open Source Blog – News about Google’s Open Source projects and programs.
• Research Blog – The latest news on Google Research.
• Student Blog – Google news and updates especially for students.
• Testing Blog
• google.org blog – News and notes from Google’s philanthropic arm.
• RechargeIT Blog

Google Product Blogs

• Base: Google Base Blog – The latest news, tips, and resources straight from the Google Base team.
• Blogger: Blogger Buzz – The Official Buzz from Blogger.
• Book Search: Inside Google Book Search – News from the Google Book Search Team.
• Checkout: The Official Google Checkout Blog – News for sellers using Google Checkout.
• Chrome: Google Chrome Releases – Announcements and release notes for the Google Chrome browser.
• Custom Search Engine: Custom Search Blog – Updates and tips from the Google Custom Search team.
• Desktop: Inside Google Desktop – The official source of information from Google desktop.
• Docs: The Official Google Docs Blog – News and notes from the Google Docs team.
• Enterprise: Google Enterprise Superstars Blog – A blog of success stories from Google’s Enterprise Search Superstars.
• Feedburner: Burning Questions – The official FeedBurner weblog
• Finance: Finance Blog – News and views from the Google Finance Team.
• Gmail: The Official Gmail Blog – News, tips and tricks from Google’s Gmail team and friends.
• Map and Earth: Google LatLong Blog – News and notes by the Google Earth and Maps team.
• Mobile: Google Mobile Blog – News and views from the Google Mobile team.
• News: Google News Blog – The official blog from the team at Google News.
• Notebook: Google Notebook Blog – News and tips from the Notebook team.
• Orkut: Orkut News and Notes – Your official guide for staying beautiful on orkut.
• Picasa: The Official Google Photos Blog – News, tips and tricks from the Picasa team at Google.
• Reader: The Official Google Reader Blog – News, tips and tricks from the Google reader team.
• Sites: Google Sites Blog – News and notes from the Google Sites team.
• SketchUp: SketchUpdate – News and notes from the SketchUp folks.
• Talk: Google Talkabout – A blog about voice, IM and open communications with Google Talk.
• Video: Google Video Blog – Showcasing cool new videos from across the web.
• Webmaster Tools: Google Webmaster Central Blog – Official news on crawling and indexing sites for the Google index.
• YouTube: YouTube Blog – The Official YouTube Blog.

Google Ads Blogs

• Google Affiliate Network Blog – News, views and product info for Google Affiliate Network advertisers and publishers.
• Google Analytics Blog – The latest news, tips and resources straight from the Google Analytics team.
• Consumer Packaged Goods Blog – News and notes from Google’s CPG vertical (Consumer Packaged Goods).
• Google Grants Blog – News and notes from the Google Grants Team.
• Inside AdSense – A look inside Google AdSense.
• Inside AdWords – Google’s official blog for news, information and tips on AdWords.
• Media Ads : Let’s Take it Offline – The latest news from Google’s TV, Print and Audio Teams.
• Website Optimizer Blog – The most up-to-date product news, industry insights and testing strategies

Google Developer Blogs

• AdWords API Blog – The official source of information about the AdWords API.
• AJAX Search API Blog – Your official source on the AJAX Search API.
• Android Developers Blog – An Open Handset Alliance Project.
• App Engine Blog -News, notes, tips and tricks from the Google App Engine Team.
• Code Blog
• Data APIs Blog – Your official source for news, tips and tricks for the Google Data APIs.
• Desktop APIs Blog – Your official source on the Google Desktop APIs.
• Gadgets API Blog – A blog for gadget developers.
• Gears API Blog -Keep up to date on Gears.
• iGoogle Developer Blog – Your source for API improvements, changes to the sandbox, and developer events.
• Maps API Blog – Your official source for news, tips and tricks for the Google Maps API.
• Mashup Editor Blog – The official source of information about the Google Mashup Editor.
• Open Source Blog – News about Google’s Open Source projects and programs.
• OpenSocial API Blog – A blog for OpenSocial developers.
• orkut Developer Blog – You’ve come to the right place to learn about APIs, changes and events related to the orkut developer platform.
• SketchUp API Blog – The latest news from the SketchUp API team.
• Web Toolkit Blog – News and note from the Google Web Toolkit Team.
• YouTube API Blog – Your official source for information on the YouTube API.

Google Regional Blogs

• Latin America Blog
• Africa Blog
• Australia Blog
• Brasil Blog
• China Blog
• Czech Republic Blog
• Italy Blog
• Japan Blog
• Korea Blog
• Poland Blog
• Russia Blog

Oops, even though Google has a development center in India, I don’t see a Google India blog. Is it just me don’t know about it or it does not exist?