Have you tried Office Live Workspace? You can access, edit, and share your files from any computer with an internet connection, and you get 5GB for free! There is even a plug-in for MS Office that lets you save your files to your online Workspace directly from whichever Office program you are using.

Check it out at http://www.workspace.officelive.com.

Cheers,
Kate
MSFT Office Live Outreach Team