Sort by Dimensions (plural) in Bridge doesn't sort by taking BOTH dimensions into account. If I want to find the images with the longest side, then the sorting doesn't work. It only looks at the image height. In other words, at this time, it should be called SORT BY PIXEL HEIGHT. Example: An image with a pixel dimension (WxH) of 7360 x 4912 gets ranked as a smaller dimension than one with a dimension of 7184 x 5310 pixels. That's because it's comparing the 2nd dimension, the width. (This has nothing to do with RESOLUTION, and there's already a sort for that. That one's all about the total number of pixels, or Length times Width.
APPLICATION: I have a directory of digital images (scanned from film) and I want to rescan the ones that are at a lowest resolution.