I’m trying out Google Speadsheets (GS) to track my monthly utility usage (I’ve also started using Mint.com to track my monthly expenditures after my brother’s recommendation). GS allows you to post your charts as an img anywhere on the web. I’m not sure yet if the image reflects the latest version of the data or if you have to repost the image each time.

I moved into the apartment Dec 21, 2008 so the data starts there.

Electricity usage:

I multiplied the dollars per kilowatt-hour by 1000 to make megawatt-hours so it would show up better on the chart
Oil usage:

You can view the spreadsheet publicly here: http://spreadsheets.google.com/ccc?key=pzQuiahdpJwqOCivSTN0BPA
You can’t edit it, but you can save a copy to your own account as a template for your own usage.