P3dO Explorer
Easy-to-use Explorer-ish Photo and 3D image viewer supporting all popular images files formats. It features selectable thumbnail image size, tile mode, slideshow, zoom, image print, catalogue print, mass renaming, zip through browsing, customizable UI, plugins and more.
http://www.senosoft.com/downloads/P3dOExplorer.zip - 2Mb - Download - Screenshot

Desktop Fusion
What if you could see images on your desktop in a viewer? What if that viewer were a part of your desktop? What if you could page instantly through your images at the click of a mouse or see them in a slide show? Desktop Fusion by Higher Math makes your desktop into a dynamic wallpaper viewer... **Use a stretched or tiled wallpaper image as a backdrop to the image viewer. ... **Desktop Fusion includes a Windows application for managing your wallpaper images and image viewer lists and for integrating all of these into your desktop in dozens of combinations.
http://www.highermath.com/fusion/setup/regnow/Setup.Exe - 4Mb - Download - Screenshot

XPicture
We made Xpicture freeware for window9x/2000 users. It has the similar features as Windows XP picture viewer. Full features list: 1. The startup speed is very fast, it is about 20% of ACD startup speed. 2. Relate to the correlative pictures and double click the picture to browse. ... Support open a folder in thumbnail form. ... 4. ... The most important, it is free. ... 3. ... The program is in small size, 5.
http://www.goztun.com/download/XPictureSetup.exe - 1Mb - Download - Screenshot

Retriever
Retriever is the best program to find duplicate and similar images on your harddisk. It is also a quick image viewer with thumbnails, slide show and database.
http://www.s.netic.de/dirk/rtrvr23.zip - 1Mb - Download - Screenshot

Scott's JPEG Commenter
Scott's JPEG commenter is a user-friendly application designed to help you edit comments in jpeg (or . jpg) files. The program provides a user-friendly explorer-like interface with a thumbnail preview viewer. Scott's JPEG commenter is free for noncommercial use, and supports Windows 95, 98, ME,...
http://www.sb-software.com/jpegcommenter/jpgcom10.exe - 1Mb - Download - Screenshot

CDI
CDI is a full-screen photo viewer, featured with thumbnail lists, full-screen view, slide show, background music, print page design. And it is absolutely portable: Small in size; No setup required, just copy it anywhere you need --- Photo CDs or Flash Disks. ... CDI supports CD auto-run, all you have to to do is inserting the disc into the drive - CDI starts up in automatic mode and displays all the photos one by one.
http://www.xuebrothers.net/cdi/cdi.htm - 510Kb - Download - Screenshot

CryptaPix
CryptaPix is a graphics viewer/encryption program for Windows 95 to XP. Supports GIF, JPG, PNG, PCX, TIF, and BMP images. Full screen slideshows. Secure 80-bit PC1 (RC4 clone) and 160-bit Blowfish encryption keeps your private image collection away from prying eyes. ... Encrypted thumbnail and WAV sound support. ... Conversion, printing and secure wipe features are also available.
http://www.briggsoft.com/download/cpx32.exe - 674Kb - Download - Screenshot

MagicMedia
MagicMedia lets you easily share images and files with family and friends through the internet. This powerful and easy to use thumbnail explorer allows you to browse, manage, play and edit multimedia files on all your local, network, and removable drives. ... To view or play a file, doubleclick a thumbnail or Drag-Drop files onto the Playlist Panel to create mixed-media playlists for convenient slide shows, movie series, or audio arrangements. ... MagicMedia's fast and powerful thumbnail generator together with the familiar Explorer-like interface make it easy to catalog and organize your...
http://www.peakstars.com/IMedia.exe - 6b - Download - Screenshot

Advanced File Manager
This file and disk management and reporting toolbox allows you to manage and monitor disk space on your network computers and servers. It indicates the size of each folder on your local, network and removable drives without clicking property pages. Advanced File Manager also allows to view space... It includes an image viewer that supports icons, bitmaps, JPEGs and GIFs in thumbnail mode. ... The program provides a file system report generator that can export to HTML and CSV. ... It supports XP themes, has a favorites engine, a DOS prompt engine and a configurable button bar for starting...
http://www.advexsoft.com/download/fmsetup.exe - 6Mb - Download - Screenshot

AhaView
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... Command line interface is available. ... You can also print, move, copy, duplicate and rename files and copy images to the clipboard. ... You can check image properties in the taskbar and assign your descriptions to images on your hard disk.
http://www.aha-soft.com/ahaview/ahaview.exe - 1Mb - Download - Screenshot