Google Docs
What a most excellent service, if you do not have gmail, or have not registered with google, this handy site gives you free access to a spreadsheet, so no matter where you are, there is your data. You can share, embed, or publish (via RSS feed) your spreadsheet, such as I do in this example of my video game log. People who already have signed up for google can be added to view, or even edit, and you can select what can and cannot be seen. Groovy!