Google announced on their official blog a list of all your accounts on Twitter:

twitter.com / Google - our central account
twitter.com / Blogger - Blogger for fans
twitter.com / GoogleCalendar - user tips & updates
twitter.com / GoogleImages - news, tips, tricks on our visual image search
twitter.com / GoogleNews - latest headlines via Google News
twitter.com / GoogleReader - from our team feed reader
twitter.com / iGoogle - news & notes from Google's personalized homepage
twitter.com / GoogleStudents - news of interest to students using Google
twitter.com / YouTube - for YouTube fans
twitter.com / YouTubeES - en Espanol
twitter.com / GoogleAtWork - solutions for IT and Workplace Productivity

Geo-related
twitter.com / SketchUp - Google SketchUp news
twitter.com/3DWH - SketchUp's 3D Warehouse
twitter.com / Modelyourtown - 3D modeling to build your favorite places
twitter.com / EarthOutreach - Earth & Maps tools for nonprofits & orgs
twitter.com / GoogleMaps - uses, tips, mashups
twitter.com / GoogleSkyMap -Android app for the night sky

Ads-related
twitter.com / adsense - for online publishers
twitter.com / AdWordsHelper - looking out for AdWords questions and tech issues
twitter.com / AdWordsProSarah - Guide for Google AdWords Help Forum
twitter.com / GoogleAnalytics - insights for website effectiveness
twitter.com / GoogleAdBuilder - re building display ads
twitter.com / GoogleRetail - for retail advertisers
twitter.com / TechnologyUK - for UK tech advertisers
twitter.com / InsideAdWordsDE - German for AdWords customers
twitter.com / GoogleAgencyDE - German for ad agencies
twitter.com / AdSensePT - info for Portuguese-language publishers
twitter.com / AdWordsRussia - AdWords tips & news in Russian
twitter.com / DentroDeAdWords - Spanish updates from the Inside AdWords blog
twitter.com / AdWordsAPI - AdWords API tips

Developer & technical
twitter.com / GoogleResearch - Scientists from our research
twitter.com / GoogleWMC - Google Webmaster Central
twitter.com / GoogleCode - latest updates for Google developer products
twitter.com / GoogleData - Data APIs Provide a standard protocol for reading and writing web data
twitter.com / app_engine - run web apps on Google infrastructure
twitter.com / DataLiberation - our initiative is complete import / export of all data
twitter.com / GoogleMapsAPI - about using Google Maps embedded in websites
twitter.com / GoogleIO - Google's largest annual developer event

Culture, People
twitter.com / googletalks - notes from our @ Google speaker series
twitter.com / googlejobs - the voice of Google recruiters

Country or Region
twitter.com / googlearabia - news from the Google Arabia Blog *

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