On the other hand, Google Docs now does PDF, too. Still, just read, but let's see if they beat Open Office to letting me write it. :-)
Yesterday, I got email with an attached .odt document. Gmail asked whether I wanted to look at it as a Google document. I said "Yes," and it came up fine. Another recipient asked for a copy in Word format "so people could read it."
I saved it in "Word format" -- Word 6, Word 95, and Word 97 -- and sent him all three. The first two were only 6 times the size of the .odt document. The third was ten times the size.