AhaView

From Aha-soft:

AhaView is a handy image viewer and converter. It displays images in all popular formats: JPEG, GIF, PNG, BMP, ICO, CUR, ANI, WBMP, XPM, XBM, TGA. It has a thumbnail mode and lets you quickly browse through numerous image files, open any of them full size with a double mouse click, and convert images to JPEG, PNG and BMP formats. Simply click on the folder you wish to view, and all image files are immediately displayed as thumbnails. Highlighting the image will display a larger image, and double clicking it will show it in the full-screen mode. You can run a slide show to automatically browse all images from folders in the full-screen mode. You can check image properties in the taskbar and assign your descriptions to images on your hard disk. You can also move, copy, duplicate and rename files and copy images to the clipboard. Command line interface is available.