After some rumblings
this past March, Microsoft has now officially joined the iPhone development community with Seadragon Mobile, a free app that lets you "infinite zoom" gigapixel-sized images. Although Seadragon is available as a Silverlight application on the desktop, Microsoft isn't bringing
Silverlight to the iPhone, so don't get your hopes up. We're itching to see if the company has any more apps in the pipeline -- we'll wish for an Office editor, but expect a Minesweeper variant.