For those of you out there who twitter, here is a list of Google accounts on twitter. Via Google blog post. Some of them are: Google, Blogger, Calendar, News, Reader, YouTube, ScetchUp, GoogleMaps, GoogleCode, GoogleData, googletalk, googlejobs, etc.
Twitter is a free social networking and micro-blogging service that enables its users to send and read each others' updates, known as tweets. (via Wikipedia.org)