IrfanView is a very fast, small, compact and innovative freeware  (for non-commercial use) graphic viewer for Windows 9x/ME/NT/2000/XP/2003/Vista

IrfanView is trying to be simple for beginners and powerful for professionals.

Main features:

• Many supported file formats 
  
• Multi language support
• Thumbnail/preview option
• Paint option - to draw lines, circles, arrows, straighten image etc
• Toolbar skins option
• Slideshow (save slideshow as EXE/SCR or burn it to CD)
• Support for Adobe Photoshop Filters
• File search
• Batch conversion (with image processing)
• Email option
• Multimedia player
• Print option
• Unicode support
• No registry changes without user action/permission!