I recently published a new control for Windows Phone (WinPRT), Windows 8 (WinRT) and WPF (.NET4.5) applications.
This control imitate a toast notification commonly used on Windows Phone device.
You can customize its style, color, font, background and animation. It’s easy to use and really fast to implement.
<toastinet:Toastinet x:Name="Toast" Title="Toastinet" Canvas.ZIndex="1" VerticalAlignment="Top" />