Source: http://lifehacker.com/5887396/google-docs-for-android-adds-collaborative-editing
The latest update to the Android version of Google Docs adds what might be the best feature of all: collaborative editing. While you've always been able to edit a document along with many other people in the web app, now Android users can join in via the native app on their phones or tablets. Additionally, this update brings rich text formatting so you can add things like ordered and bulleted lists, color variations, and standard text styles like bold and italic. Check out the video above for a quick look at these new features, or just download the app to try them out for yourself.
Collaborate and edit anywhere with the updated Google Docs for Android | Official Google Blog via Engadget