Google Spreadsheets

Google Spreadsheets is Google's "software as a service" version of an office spreadsheet. Spreadsheets, forms 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 (OpenOffice, HTML, PDF, RTF, Text, Word). By default, they are saved to the Google servers. Open documents are automatically saved to prevent data loss, and a revision history is automatically kept. Documents can be tagged and archived for organizational purposes. The service is officially supported on recent versions of the Firefox, Internet Explorer, Safari and Chrome browsers running on Microsoft Windows, Apple OS X, and Linux operating systems