Mobile content site Myxer is crowing that it has passed the 20 million user milestone - and that those users are downloading some 55 million items per month. Overall since its launch, Myxer has seen some 350 million downloads of its ad-supported mobile content.

Myxer's user community consists largely of that coveted teen and college-age demographic, which could explain why the site averages 21 downloads per second. It also helps that Myxer has more than 1.7 million pieces of content to choose from on its ad-supported site.