Pixel Count.
Here's the file. It might have some debug info left over, but it does the job.
Note: Don't use too large of files, since I purposely put in a bubble sort (for smaller images).
This also uses the .NET framework (grr, Microsoft!

), so you may have to download an approx. 105-108 meg file from Microsoft.
Download the .NET Framework if you get any kind of "Application Failed to Initialize" error. Also, the pixel info listbox (one on the left) is disabled to speed up the program a bit.