Francesco De Vittori discusses pinch zooming in Silverlight for Windows Phone 7.
Source: Index Out Of Range
Pinch zooming is one of those things that look incredibly simple until you actually try to implement them. At that point you realize it hides quite a number of intricacies that make it hard to get it right. If you tried to implement pinch zooming in Silverlight for Windows Phone 7 you probably know what I’m talking about.