This is one of those, "well I didn't really need this, but the fact that this is even possible is pretty frakking cool" stories.
From Moto Labs, those same wacky guys who brought us thedisplay, comes the DIY Android Home Energy Monitor (or AHEM, as in "ahem, look at my clever acronym").
The AHEM can use an average wireless network to track your utility readings and post them on your Google home page. Here's how it works. Wireless Webcams take pictures of the ever-changing dials on the user's utility meters.
The AHEM application transcribes the reading numbers into your Flickr image tag. Then, Moto Labs' Google Gadget will automatically chart meter activity on your Google home page.
Check out the site to see all you need to get started and get step-by-step instructions on how to set the whole thing up.