Optimage - Advanced image optimization tool
ThumbView - ThumbView enables image thumbnails and tooltips in Microsoft Windows XP Explorer (does not work on...
ImageOptim API - Web service for image compression
MysticThumbs - MysticThumbs generates thumbnails of many image types not natively supported by Windows.
Imagify - Optimize and resize images online and through your CMS.
Pictus - Pictus is a fast, free image viewer that enables Windows to see thumbnails of supported formats, such as PSD. Give it a spin today!