Microsoft's build developer conference has kicked off in Seattle today, and the company is using it to showcase some new Windows 8 apps. PayPal will supply an API for Windows 8 developers that allows them to use the PayPal payment system within any Windows Store app. Microsoft also announced a new Dropbox app for Windows 8 that is simply "coming soon."

A new ESPN app will aggregate scores and video alongside photo galleries and podcasts with pin support for Windows 8's new Start screen. Microsoft is also demonstrating new apps from Disney and Lego which are due in the Windows Store soon.