The new Alignment Override just ROCKS!
Thanks for this! 
And I just noticed that the Image Viewer is able to compare with PSD (AdobePhotoshop) files! As a WebDeveloper I often use CSS Sprites, and it is often hard to notice any differences between the output formats (PNG, GIF, JPEG) and the source image. Now I can just compare a folder of output files with the source PSDs and can easily compare every image
And I just noticed that the Image Viewer is able to compare with PSD (AdobePhotoshop) files! As a WebDeveloper I often use CSS Sprites, and it is often hard to notice any differences between the output formats (PNG, GIF, JPEG) and the source image. Now I can just compare a folder of output files with the source PSDs and can easily compare every image