Here are some other official Twitter accounts for Google services and products:
* YouTube, which has more than 14,000 followers
* Blogger, which answers many questions from users
* Google Reader, which share useful tricks for using the feed reader more effectively
* Google Apps, a feed that shares articles about the evolution of Google's software-as-a-service business
* App Engine - a not-so-frequently updated list of Google App Engine news.
In other news, you can follow the latest headlines from this blog at twitter.com/googleos, where I'll also post news and tips not included in the blog. Send your tips, questions and suggestions to @googleos.