The following are some of the main features of Bitmap for Silverlight that you may find useful:

• Reduce/Crop Images
  Editing the pixels enables you to resize images and reduce the resolution, which reduces the file size and results in faster upload time. Also, you can crop users' images in order to upload only part of them as you do in Facebook or any other web user account.
• Edit Images Programmatically
  The C1Bitmap class allows you to access individual pixels to create special effects, crop, resize, or transform images in any way you want.
• Save Generated Images as JPG/PNG
  With Silverlight 3, you can take screen shots using the WritableBitmap, then pass it to C1Bitmap and save the result into a new PNG/JPG file on the fly.