We're not quite sure why Microsoft didn't make mention of it during its big event yesterday, but the company has now confirmed that its forthcoming "Mango" update will also bring with it another big addition to the Windows Phone scene: a web-based Marketplace. That will of course let you browse and buy apps right from your favorite web browser, and then have them installed on your phone ("via SMS or email," apparently). You'll also be able to take advantage of various social