Just found this - you can get access to MS Office Web Apps via SkyDrive for free.
All you need for personal use is a free Windows Live ID.
The MS blurb:
"Whether you’re in the office, at home, or on the road, Microsoft Office Web Apps help you get more things done virtually anywhere and anytime. These convenient online companions to Microsoft Word, Excel, PowerPoint, and OneNote offer you an easy way to access, view, and edit documents directly from your Web browser."