***Have you ever struggled with the tiny pop-up list in the UV/Image Editor? So have I!
Therefore, I made an addon that enables to pop-up an extra image list with specified number of rows and columns. Now you can finally display all your image datablocks by single click and select the right one.
Moreover, the addon contains a button to clear all users for the selected image datablock. So, the image datablock can disappear after save and reload of the blend file and you can easily get rid of unwanted image datablocks.