One of the hallmarks of the Web 2.0 movement was the use of rounded corners in pretty much every element that graced the pages of any hot new start up. These rounded corners were often accompanied by two other elements: the lozenge-like lighting on buttons and the mirrored reflections on an imagined surface.
Here's a snippet of the Picnik website with lots of rounded goodness:
Apple adopted this idiom in many of its products. The Safari browser uses the reflections in its grid presentation of browsing history:
and perhpas most famously, the iPhone design language is all about the rounded corners of Web 2.0 stickers:
The new Web 2.0 design idiom, however, is all about squares. For example, the new BBC design uses simple blocks and solid colours:
Making the transition complete, this squared approach to design will be the hallmark of the Windows Phone 7 UX:
As the web adopts these new crisp corners, will the iPhone UI start to look stale, just as it looked fresh and current when it launched?