Would there be any interest out there in either of these:

• Encrypted Image - The resulting file would simply be a binary file that to anybody without the proper key would be unable to view the image contents. This would be a two part distribution -- the plugin dll and then a seperate utility that would prompt for the key and the encrypted image file.
• Windows Bounds Clipping - The idea would be to attempt to analyze the screen clipping and only write an image out that had the bounds of the window. I am not yet sure of the feasibility of this but would a fun excuse to research the GDI+ capabilities a bit.

So, leave a comment and let me know what you think.