For those who need to resize images quickly, you can use several utilities to assist you in this process. Windows XP - Microsoft's Image Resizer Powertoy for Windows XP. Utility that lets you resize one or more selected image files directly from Windows Explorer by right-clicking selecting resize picture.
Windows 7 - Open source solution at http://imageresizer.codeplex.com/Help from open source providers. They created PhotoToyClone to help us out for Windows 7 users. See site above.