Finding the houses where people have looked from. Keep zooming in. I have to admit I couldn't find myself.
Not surprising or worrying (to me at least), this is just more Web2.0 putting disparate information together (i.e. a map and a list of IP address').
Even this site logs your IP address (which can be used to determine your rough geographical location, look at the bottom of any of the messages that you've posted and you'll see the IP address from where you posted, whilst other users are indicated as being "Logged").
If you want to mask where your browsing from use a proxy server or some sort of annonymiser (clickety-click -->
)
Yet again I've gone