Google Docs for mobile devices
Google Docs version is already available to mobile devices. At present the system gives only access to the documents online, excluding the capability to make and save any changes. The Google’s service is soon expected to allow its users to create, modify and store documents online via the web-browsers of their mobile devices. It will also offer them the capability to grant access to their documents to other users over the Google Docs network.
source: Google via EngadgetMobile
Things that are NOT allowed: