Google Docs & spreadsheets

Google Docs & Spreadsheets, sometimes referred to as Google Docs, is a Web-based word processor and spreadsheet application offered by Google. It allows users to create and edit documents and spreadsheets online while collaborating in real-time with other users. Docs & Spreadsheets combines the features of two services, Writely and Spreadsheets, which were merged into a single product on October 10, 2006. A third product for presentations, originally designed by Tonic Systems, is expected for the summer of 2007.
Documents and spreadsheets can be created within the application itself, imported through the web interface, or sent via email. They can also be saved to the user's computer in a variety of formats. By default, they are saved to Google's servers. Open documents are automatically saved to prevent data loss. Documents can be tagged and archived for organizational purposes.