Update:  Follow-up with source and live demo posted here!

The other day, I found a truly great tool.  It’s called Shazzam and its for use in developing HLSL pixel shaders for WPF and Silverlight.  It has an editor for writing your HLSL, automatically compiles your shader, lets you test it against an image or video, including playing with the inputs.  And finally, it automatically writes a C# or VB wrapper for your shader to let you use it as an effect in your WPF or Silverlight project.  This is just a great tool.  Make sure to support the authors.

Shazzam

A few examples of pixel shader effects we made with the help of Shazzam:

An animated underwater wavy/blurry filter:

A shader for doing telescopic blur: