Windows 7 WPF Sensor Triggers with custom editors for Expression Blend.

SensorTrigger: A Trigger that can be configured to respond to specific sensors or sensor types
ReportLocationAction: An Action for TextBlocks that reports location for a SensorTrigger

Using a DataGrid in Silverlight, it is sometimes necessary to have a button in a row cell expand the row details. Attach this behavior to the button to toggle the Visibility of that row's detail view.

This behavior adds Multi-Touch Manipulation (Translate, Zoom, Rotate) and Inertia on enabled devices.

The SyncScrollViewer behavior allows you to sync the horizontal and/or vertical offsets of any number of ScrollViewers. They need not be at the same level in the Visual Tree to be synced.
The behavior works much liked theGrid.IsSharedSizeScope attached property in that you can a

This behavior binds to a developer-provided property that determines whether the app/dialog or region is in a busy state. When the property turns true, the background is gradually dimmed and a circular progress indicator animation is shown.

This behavior listen to Visibility property of an element and animate changes.

This behavior enables you to save a DependencyObject property in the Isolated Storage and retrive it at the application startup.

Multi-Touch & Mouse interactivities for Deep Zoom in Silverlight 3.

This behaviour enables mouse wheel scroll on datagrids and is based on some blogs I have found. Just providing it here as there is no other solution in the gallery yet.

In Silverlight when in full-screen mode keyboard input is, by design, constrained to a limited set of keys – to overcome this limitation the provided Virtual Input Keyboard control and accompanying behaviours, allows you to attach an on-screen keyboard onto any UI control.