I've signed up for a Zoho Writer account and had a look around. I created a test spreadsheet to see how it worked. I have a spreadsheet program at home but not excel and it can't do multiply sheets which zoho can. My partner doesn't have a spreadsheet program on her computer so maybe this would be good for her to use.
Then I had a look at the writer program and read the welcome document to see what it can do. I can see that it would be useful for sharing and editing documents away form your own computer.
I have written this post using Zoho Writer and will try exporting it to my blog. If it is in my blog then it works.