I use Paint.NET to do small and quick photo edits. Usually I just take red-eye out and maybe enhance the coloring. If I want to do this to 40 images and they are all in the same folder....it can take awhile because I have to open them one by one.
It would be nice if you had some sort of image browser integrated into the program. The left hand pane would come with a Windows Explorer style interface and allow you to click a picture and have it open up in the right hand pane (just like using the File>Open command.
Keep up the great work!