MysticThumbs - MysticThumbs generates thumbnails of many image types not natively supported by Windows.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
ThumbView - ThumbView enables image thumbnails and tooltips in Microsoft Windows XP Explorer (does not work on...
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats
Icaros - Icaros is a collection of lightweight, high quality, Windows Shell Extensions
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.