Google Docs

Google Docs - online documents with real-time collaboration
Web-based documents, spreadsheets, drawings and presentations that let users edit the same file at the same time so you always have the latest version.
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Anytime, anywhere access to your workGoogle Docs is securely powered by the web, giving you the flexibility to be productive from your desk, on the road, at home and on your mobile phone, even when you're offline.
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Works across operating systemsGoogle Docs works in the browser on PC, Mac, and Linux computers, and supports popular formats such as .doc, .xls, .ppt, and .pdf.
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Easily upload and share filesFiles stored on Google Docs are always accessible and backed-up online.
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Secure access controlsAdministrators can manage file sharing permissions system-wide, and document owners can share and revoke file access at any time.