The Official Google Blog: it gives you list of all Google accounts on Twitter you can follow
Should be a good resource
http://twitter.com/Google - our central account
http://twitter.com/Blogger - for Blogger fans
http://twitter.com/GoogleCalendar - user tips & updates
http://twitter.com/GoogleImages - news, tips, tricks on our visual image search
http://twitter.com/GoogleNews - latest headlines via Google News
http://twitter.com/GoogleReader - from our feed reader team
http://twitter.com/iGoogle - news & notes from Google's personalized homepage
http://twitter.com/GoogleStudents - news of interest to students using Google
http://twitter.com/YouTube - for YouTube fans
http://twitter.com/YouTubeES - en Espanol
http://twitter.com/GoogleAtWork - solutions for IT and workplace productivity
Geo-related
http://twitter.com/SketchUp - Google SketchUp news
http://twitter.com/3DWH - SketchUp's 3D Warehouse
http://twitter.com/Modelyourtown - 3D modeling to build your favorite places
http://twitter.com/EarthOutreach - Earth & Maps tools for nonprofits & orgs
http://twitter.com/GoogleMaps - uses, tips, mashups
http://twitter.com/GoogleSkyMap -Android app for the night sky
Ads-related
http://twitter.com/AdSense - for online publishers
http://twitter.com/AdWordsHelper - looking out for AdWords questions and tech issues
http://twitter.com/AdWordsProSarah - Google Guide for AdWords Help Forum
http://twitter.com/GoogleAnalytics - insights for website effectiveness
http://twitter.com/GoogleAdBuilder - re building display ads
http://twitter.com/GoogleRetail - for retail advertisers
http://twitter.com/TechnologyUK - for U.K. tech advertisers
http://twitter.com/InsideAdWordsDE - for German AdWords customers
http://twitter.com/GoogleAgencyDE - for German ad agencies
http://twitter.com/AdSensePT - info for Portuguese-language publishers
http://twitter.com/AdWordsRussia - AdWords news & tips in Russian
http://twitter.com/DentroDeAdWords - Spanish updates from the Inside AdWords blog
http://twitter.com/AdWordsAPI - AdWords API tips
Developer & technical
http://twitter.com/GoogleResearch - from our research scientists
http://twitter.com/GoogleWMC - Google Webmaster Central
http://twitter.com/GoogleCode - latest updates for Google developer products
http://twitter.com/GoogleData - Data APIs provide a standard protocol for reading and writing web data
http://twitter.com/app_engine - web apps run on Google infrastructure
http://twitter.com/DataLiberation - our initiative for complete import/export of all data
http://twitter.com/GoogleMapsAPI - about using Google Maps embedded in websites
http://twitter.com/GoogleIO - Google's largest annual developer event
Culture, People
http://twitter.com/googletalks - notes from our @Google speaker series
http://twitter.com/googlejobs - the voice of Google recruiters
Country or Region
http://twitter.com/googlearabia - news from the Google Arabia Blog*
http://twitter.com/googledownunder - Google activities in Australia & New Zealand
http://twitter.com/GoogleDE - Google in Germany
http://twitter.com/GoogleKorea - News & notes in Korean*
http://twitter.com/GoogleLatAm - Latin America (en Espanol)
http://twitter.com/GooglePolicyIt - Notes on Google policy issues in Italy
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