Internet Usage Information Source
comScore describes itself as "a global leader in measuring the digital world and the preferred source of digital marketing intelligence". I'm fond of their "press releases" page, as it provides links to brief articles featuring measurements of users of the Internet from countries around the globe. In the past, I came to rely on sites like this, only to see them stop publication of material without any warning. I'll keep my eye on this one, as it seems pretty hip. Pass it on to your e-clients, too.