Feedjit tracks the visitors to your blog and according to this site, it loads pretty fast too as a widget. Anybody tried it yet?

Feedjit is offering a widget that provides information about who is visiting your blog or website. An entry is posted to the widget everytime a person arrives at your website and again when the person leaves. Feedjit entries list both the webpage your visitors came from (the referring website) and where they live in the world. Feedjit also posts a little flag again to indicate what country each visitor is from. Feedjit also offers a seperate map widget that shows the locations of the last 100 visitors to your website.