TweakUI

TweakUI is another desktop enhancement to help you control the appearance of Windows, change the location of default folders and so much more.

TweakUI screenshot

Windows Live Photo Gallery

Windows Live Photo Gallery Live Gallery has a wonderful photo stitching feature for making panoramas.

For advanced photo editing, use

Windows Live Photo Gallery screenshot

GIMP

GIMP is a free and open-source image editing software. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc.
GIMP is totally a free image editing software worth trying for simple image editing tasks.

GIMP screenshot

Paint.NET

Paint.NET It features an intuitive and innovative user interface with support for layers, unlimited undo, special effects, and a wide variety of useful and powerful tools.

Paint.NET screenshot

ThunderBird

ThunderBird can be used if you like checking and replying to your web email from the desktop. It also allow you to check multiple Emails and apply filters to the incoming mail.

ThunderBird screenshot