There are many online word processor out there. You can choose to use Google Doc, ThinkFree, Zoho and many more. Shutterborg is another FREE online word processor that runs entirely in your web browser.
One should not be deceived by the MAC-feel on the home page. Basically Shutterborg offers the basic services like any other online word processor. You can open and edit a file. You also can find the basic features like bold, italic, underline, and font customization. Once you have finished editing your file, you are allowed to save in html format. (Which is not a good format for word processor files.)
We just added the ability to save as MS Word and PDF.