Am using IrfanView for more than 2 years. and this is one of the utilities I used to install on a fresh pc.
IrfanView is a very fast, small, compact and innovative FreeWARE (for non-commercial use) graphic viewer for Windows 9x, ME, NT, 2000, XP, 2003 , 2008, Vista, Windows 7.
Paint option - to draw lines, circles, arrows, straighten image etc.
Slideshow (save slideshow as EXE/SCR or burn it to CD)
Batch resize and format conversion using IrfanView
It supports plugins which will help you to make the irfanview something more than an image viewer.
Read more about IrfanView here and PlugIns here
2. FastStone Image Viewer
FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor. It has a nice array of features that include image viewing, management, comparison, red-eye removal, emailing, resizing, cropping and color adjustments.
batch convert images into PDF files
Image modification tools: Resize/resample, rotate/flip, crop, sharpen/blur, brightness/contrast, etc.
Compare images side-by-side (up to 4 at a time) to easily cull those forgettable shots
Image EXIF metadata support
Acquire images from a scanner
screen capture capability
Portable version of the program
Read more and download Free FastStone image viewer
It supports more than 400 graphics formats.
Batch convert, batch rename
Compare image side by side
Auto levels, contrast
Read more about the features here and XnView home page here
4. CoffeeCup Free Image Viewer
CoffeeCup Free Image Viewer is a fast, powerful, and easy-to-use image viewer and more. It has built-in e-mail, FTP, and ZIP functions that allow you to select a group of images and e-mail them to a friend, upload them to your Website, or create a ZIP file, all from within the program.
The built-in e-mail function
built-in FTP function
Image Slice tool
Runs On: Windows 7, Vista, XP
Read more and Download CoffeeCup Free Image Viewer
5. Zoner Photo Studio Free
Zoner Photo Studio Free is a free program for every step in the process of managing, editing, and sharing pictures. For every step from the very start, since it offers easy downloading from a camera or scanner.
Acquiring pictures from a camera
Displaying RAW thumbnails
Quick Fix function
Standard editing functions
Easy uploader for Flickr and Facebook
Operating System: XP/Vista/7 (runs on 32/64-bit Windows)
Read more and download Zoner Photo Studio Free
6. WildBit Viewer
WildBit Viewer is compact & fast image viewer with slide show and editor. WildBit Viewer also includes shell toolbar, you can drop your favorite folder there and use it as an organizer.
supports all major graphic formats including BMP, JPEG, JPEG 2000, GIF, PNG, PCX, TIFF, WMF and TGA (over 70 formats).
Shell Tool Bar for organizing images
Generate Image Info to CSV
Acquiring images from scanner
Image Auto Adjustments (Auto Luminosity, Auto Sharpness, Auto Equalize, Auto White Balance, Auto White Balance (Gray World) and Auto Image Enhance)
Red Eye Removal
Batch with actions (Rotate, Resize Image, Brightness/Contrast, Gamma Correction, Blur/Sharpen, HSL, Grayscale, Negative, Sepia, Change image colors, Auto Luminosity, Auto Sharpness, Auto Equalize, Auto White Balance (Gray World), Lossless Transform, Metadata actions) and converting to another format (bmp, jpg, png, tif, pcx, tga, ico and pdf) is possible
Read more and download WildBit Viewer