Box.net offers a virtual file explorer for your uploaded documents, pictures and videos. You can put this file explorer anywhere in your website and visitors can easily navigate through your files, download them offline or they can subscribe to your files in their newsreader.
Today, Box.net unveiled another useful service called "Office on Demand" - this is an add-on for your Microsoft Office programs that will let you save files directly from Word, Excel or Powerpoint directly to your online Box.net account. No need to launch your web browser.
Other than the convenience factor, Box.net is tightly integrated with Zoho Docs and Zoho sheet. Even if your computer has no Office license, you can still edit the .DOC or .XLS files from Box.net directly in Zoho Office and save the edited files back to Box.net.
Download Box.net Add-on | Thanks Zoli Erdos
I am also expecting Google to release an Office plugin that will allow offline editing of documents stored in Google Docs & Spreadsheets.
Related: Editing Zoho Docs Offline in Microsoft Word