JPEGView

JPEGView overview:

• it's essentially free (postcardware), simple, and easy to use
• requires only 800k, but will effectively use more memory to run faster
• produces some of the highest-quality images available on the Macintosh
• decompresses images faster than almost any other Macintosh image software
• provides an excellent user-configurable slide show
• automatically scales images to fit on your monitor
• has handy full screen windows (without the menubar) for large images
• supports multiple-monitor systems extremely well
• includes exhaustive on-line documentation and balloon help
• is System 7-studly, featuring full AppleScript support and 32-bit cleanliness
• native code takes full advantage of PowerMacintosh systems
• comes with a cool colorful JPEG test image :-)

JPEGView is in FAT binary, which means it will work optimally for both PPC and 68k machines.